diff --git a/.github/workflows/parachain.yml b/.github/workflows/parachain.yml
index d0b0ae3f616da..76966ef6c902b 100644
--- a/.github/workflows/parachain.yml
+++ b/.github/workflows/parachain.yml
@@ -15,6 +15,11 @@ on:
       - "!parachain/LICENSE"
   workflow_dispatch:
 
+env:
+  FUZZ_MAX_LEN: 10000000000
+  FUZZ_MAX_RUNS: 30000
+  RUST_NIGHTLY: "2023-05-23"
+
 jobs:
   check:
     runs-on: snowbridge-runner
@@ -140,3 +145,43 @@ jobs:
           --manifest-path cumulus/Cargo.toml
           --release --verbose
           --package bridge-hub-rococo-runtime
+
+  beacon-fuzz:
+    needs: test
+    runs-on: snowbridge-runner
+    env:
+      CARGO_INCREMENTAL: 0
+      RUST_BACKTRACE: 1
+      RUSTFLAGS: -C debuginfo=1
+      SKIP_WASM_BUILD: 1
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          ref: ${{ github.head_ref }}
+      - uses: actions/cache@v1
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+          key: ${{ runner.os }}-cargo-${{ hashFiles('parachain/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
+      - name: install nightly
+        run: rustup install --profile minimal nightly-$RUST_NIGHTLY
+      - name: Install cargo-fuzz from crates.io
+        uses: baptiste0928/cargo-install@v2
+        with:
+          crate: cargo-fuzz
+          version: "^0.11.2"
+      - name: Fuzz force checkpoint extrinsic
+        run: >
+          cd parachain/pallets/ethereum-beacon-client && cargo +nightly-$RUST_NIGHTLY fuzz run fuzz_force_checkpoint --
+          -max_len=$FUZZ_MAX_LEN -runs=$FUZZ_MAX_RUNS
+      - name: Fuzz submit extrinsic
+        run: >
+          cd parachain/pallets/ethereum-beacon-client && cargo +nightly-$RUST_NIGHTLY fuzz run fuzz_submit --
+          -max_len=$FUZZ_MAX_LEN -runs=$FUZZ_MAX_RUNS
+      - name: Fuzz submit execution header extrinsic
+        run: >
+          cd parachain/pallets/ethereum-beacon-client && cargo +nightly-$RUST_NIGHTLY fuzz run fuzz_submit_execution_header --
+          -max_len=$FUZZ_MAX_LEN -runs=$FUZZ_MAX_RUNS
diff --git a/parachain/Cargo.lock b/parachain/Cargo.lock
index 98adb20f28eed..9421e6d1393c6 100644
--- a/parachain/Cargo.lock
+++ b/parachain/Cargo.lock
@@ -219,7 +219,7 @@ version = "0.10.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "46502ad458c9a52b69d4d4d32775c788b7a1b85e8bc9d482d92250fc0e3f8efe"
 dependencies = [
- "digest 0.10.6",
+ "digest 0.10.7",
 ]
 
 [[package]]
@@ -644,9 +644,9 @@ dependencies = [
 
 [[package]]
 name = "digest"
-version = "0.10.6"
+version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8168378f4e5023e7218c89c891c0fd8ecdb5e5e4f18cb78f38cf245dd021e76f"
+checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
  "block-buffer 0.10.3",
  "crypto-common",
@@ -741,7 +741,7 @@ checksum = "6ea5a92946e8614bb585254898bb7dd1ddad241ace60c52149e3765e34cc039d"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.6",
+ "digest 0.10.7",
  "ff",
  "generic-array 0.14.6",
  "group",
@@ -1291,7 +1291,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.6",
+ "digest 0.10.7",
 ]
 
 [[package]]
@@ -1440,15 +1440,15 @@ dependencies = [
 
 [[package]]
 name = "k256"
-version = "0.13.0"
+version = "0.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "955890845095ccf31ef83ad41a05aabb4d8cc23dc3cac5a9f5c89cf26dd0da75"
+checksum = "cadb76004ed8e97623117f3df85b17aaa6626ab0b0831e6573f104df16cd1bcc"
 dependencies = [
  "cfg-if",
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.6",
+ "sha2 0.10.7",
 ]
 
 [[package]]
@@ -1988,7 +1988,7 @@ version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "83a0692ec44e4cf1ef28ca317f14f8f07da2d95ec3fa01f86e4467b725e60917"
 dependencies = [
- "digest 0.10.6",
+ "digest 0.10.7",
 ]
 
 [[package]]
@@ -2532,13 +2532,13 @@ dependencies = [
 
 [[package]]
 name = "sha2"
-version = "0.10.6"
+version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "82e6b795fe2e3b1e845bafcb27aa35405c4d47cdfc92af5fc8d3002f76cebdc0"
+checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.6",
+ "digest 0.10.7",
 ]
 
 [[package]]
@@ -2547,7 +2547,7 @@ version = "0.10.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bdf0c33fae925bdc080598b84bc15c55e7b9a4a43b3c704da051f977469691c9"
 dependencies = [
- "digest 0.10.6",
+ "digest 0.10.7",
  "keccak",
 ]
 
@@ -2572,7 +2572,7 @@ version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8fe458c98333f9c8152221191a77e2a44e8325d0193484af2e9421a53019e57d"
 dependencies = [
- "digest 0.10.6",
+ "digest 0.10.7",
  "rand_core 0.6.4",
 ]
 
@@ -2600,9 +2600,9 @@ dependencies = [
 
 [[package]]
 name = "smallvec"
-version = "1.10.0"
+version = "1.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
+checksum = "62bb4feee49fdd9f707ef802e22365a35de4b7b299de4763d44bfea899442ff9"
 
 [[package]]
 name = "snowbridge-beacon-primitives"
@@ -2935,8 +2935,8 @@ source = "git+https://github.com/paritytech/substrate.git?branch=master#e9769646
 dependencies = [
  "blake2b_simd",
  "byteorder",
- "digest 0.10.6",
- "sha2 0.10.6",
+ "digest 0.10.7",
+ "sha2 0.10.7",
  "sha3",
  "sp-std",
  "twox-hash",
@@ -3475,7 +3475,7 @@ dependencies = [
  "pbkdf2 0.11.0",
  "rand 0.8.5",
  "rustc-hash",
- "sha2 0.10.6",
+ "sha2 0.10.7",
  "thiserror",
  "unicode-normalization",
  "wasm-bindgen",
@@ -3643,7 +3643,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "97fee6b57c6a41524a810daee9286c02d7752c4253064d0b05472833a438f675"
 dependencies = [
  "cfg-if",
- "digest 0.10.6",
+ "digest 0.10.7",
  "rand 0.8.5",
  "static_assertions",
 ]
diff --git a/parachain/pallets/ethereum-beacon-client/Cargo.toml b/parachain/pallets/ethereum-beacon-client/Cargo.toml
index c0b338095c8f6..01f617fc2ad44 100644
--- a/parachain/pallets/ethereum-beacon-client/Cargo.toml
+++ b/parachain/pallets/ethereum-beacon-client/Cargo.toml
@@ -12,6 +12,7 @@ targets = ["x86_64-unknown-linux-gnu"]
 
 [dependencies]
 serde = { version = "1.0.164", optional = true }
+serde_json = { version = "1.0.96", optional = true }
 codec = { version = "3.1.5", package = "parity-scale-codec", default-features = false, features = [ "derive" ] }
 scale-info = { version = "2.7.0", default-features = false, features = [ "derive" ] }
 ssz_rs = { version="0.9.0", default-features = false }
@@ -32,17 +33,27 @@ snowbridge-ethereum = { path = "../../primitives/ethereum", default-features = f
 primitives = { package = "snowbridge-beacon-primitives", path = "../../primitives/beacon", default-features = false }
 static_assertions = { version = "1.1.0" }
 bp-runtime = { git = "https://github.com/Snowfork/cumulus.git", branch = "snowbridge", default-features = false }
+pallet-timestamp = { git = "https://github.com/paritytech/substrate.git", branch = "master", optional = true }
+sp-io = { git = "https://github.com/paritytech/substrate.git", branch = "master", optional = true }
 
 [dev-dependencies]
 rand = "0.8.5"
 sp-keyring = { git = "https://github.com/paritytech/substrate.git", branch = "master" }
-sp-io = { git = "https://github.com/paritytech/substrate.git", branch = "master" }
 serde_json = "1.0.96"
-hex-literal = { version = "0.4.1" }
+hex-literal = "0.4.1"
 pallet-timestamp = { git = "https://github.com/paritytech/substrate.git", branch = "master" }
+sp-io = { git = "https://github.com/paritytech/substrate.git", branch = "master" }
+serde = "1.0.164"
 
 [features]
 default = ["std"]
+fuzzing = [
+    "sp-io",
+    "pallet-timestamp",
+    "serde",
+    "serde_json",
+    "hex-literal"
+]
 std = [
     "serde",
     "codec/std",
diff --git a/parachain/pallets/ethereum-beacon-client/fuzz/.gitignore b/parachain/pallets/ethereum-beacon-client/fuzz/.gitignore
new file mode 100644
index 0000000000000..2f940cc8b2ea7
--- /dev/null
+++ b/parachain/pallets/ethereum-beacon-client/fuzz/.gitignore
@@ -0,0 +1,5 @@
+target
+corpus
+artifacts
+coverage
+.idea
diff --git a/parachain/pallets/ethereum-beacon-client/fuzz/Cargo.lock b/parachain/pallets/ethereum-beacon-client/fuzz/Cargo.lock
new file mode 100644
index 0000000000000..6b488775b1559
--- /dev/null
+++ b/parachain/pallets/ethereum-beacon-client/fuzz/Cargo.lock
@@ -0,0 +1,3898 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "Inflector"
+version = "0.11.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fe438c63458706e03479442743baae6c88256498e6431708f6dfc520a26515d3"
+dependencies = [
+ "lazy_static",
+ "regex",
+]
+
+[[package]]
+name = "addr2line"
+version = "0.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a76fd60b23679b7d19bd066031410fb7e458ccc5e958eb5c325888ce4baedc97"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "addr2line"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f4fa78e18c64fce05e902adecd7a5eed15a5e0a3439f7b0e169f0252214865e3"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
+[[package]]
+name = "ahash"
+version = "0.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fcb51a0695d8f838b1ee009b3fbf66bda078cd64590202a864a8f3e8c4315c47"
+dependencies = [
+ "getrandom 0.2.10",
+ "once_cell",
+ "version_check",
+]
+
+[[package]]
+name = "ahash"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c99f64d1e06488f620f932677e24bc6e2897582980441ae90a671415bd7ec2f"
+dependencies = [
+ "cfg-if",
+ "getrandom 0.2.10",
+ "once_cell",
+ "version_check",
+]
+
+[[package]]
+name = "aho-corasick"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43f6cb1bf222025340178f382c426f13757b2960e89779dfcb319c32542a5a41"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "amcl"
+version = "0.3.0"
+source = "git+https://github.com/snowfork/milagro_bls?rev=a6d66e4eb89015e352fb1c9f7b661ecdbb5b2176#a6d66e4eb89015e352fb1c9f7b661ecdbb5b2176"
+dependencies = [
+ "parity-scale-codec",
+ "scale-info",
+]
+
+[[package]]
+name = "android-tzdata"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e999941b234f3131b00bc13c22d06e8c5ff726d1b6318ac7eb276997bbb4fef0"
+
+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
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+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "ansi_term"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d52a9bb7ec0cf484c551830a7ce27bd20d67eac647e1befb56b0be4ee39a55d2"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "anyhow"
+version = "1.0.72"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b13c32d80ecc7ab747b80c3784bce54ee8a7a0cc4fbda9bf4cda2cf6fe90854"
+
+[[package]]
+name = "approx"
+version = "0.5.1"
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+checksum = "cab112f0a86d568ea0e627cc1d6be74a1e9cd55214684db5561995f6dad897c6"
+dependencies = [
+ "num-traits",
+]
+
+[[package]]
+name = "arbitrary"
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+checksum = "e2d098ff73c1ca148721f37baad5ea6a465a13f9573aba8641fbbbae8164a54e"
+dependencies = [
+ "derive_arbitrary",
+]
+
+[[package]]
+name = "array-bytes"
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+
+[[package]]
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+
+[[package]]
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+checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
+
+[[package]]
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+
+[[package]]
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+checksum = "cc6dde6e4ed435a4c1ee4e73592f5ba9da2151af10076cc04858746af9352d09"
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+
+[[package]]
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+ "libc",
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+ "rustc-demangle",
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+
+[[package]]
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+
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+
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+checksum = "3078c7629b62d3f0439517fa394996acacc5cbc91c5a20d8c658e77abd503a71"
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+]
+
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+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa79dedbb091f449f1f39e53edf88d5dbe95f895dae6135a8d7b881fb5af73f5"
+dependencies = [
+ "byte-tools",
+]
+
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+name = "bounded-collections"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eb5b05133427c07c4776906f673ccf36c21b102c9829c641a5b56bd151d44fd6"
+dependencies = [
+ "log",
+ "parity-scale-codec",
+ "scale-info",
+ "serde",
+]
+
+[[package]]
+name = "bp-runtime"
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diff --git a/parachain/pallets/ethereum-beacon-client/fuzz/Cargo.toml b/parachain/pallets/ethereum-beacon-client/fuzz/Cargo.toml
new file mode 100644
index 0000000000000..87ae60d87e415
--- /dev/null
+++ b/parachain/pallets/ethereum-beacon-client/fuzz/Cargo.toml
@@ -0,0 +1,41 @@
+[package]
+name = "snowbridge-ethereum-beacon-client-fuzz"
+version = "0.0.0"
+publish = false
+edition = "2021"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = { version = "0.4", features = [ "arbitrary-derive" ]}
+arbitrary = { version = "1", optional = true, features = ["derive"] }
+snowbridge-ethereum-beacon-client = {path = "..", features = [ "fuzzing" ]}
+snowbridge-beacon-primitives= {path = "../../../primitives/beacon"}
+hex-literal = "0.4.1"
+sp-core = { git = "https://github.com/paritytech/substrate.git", branch = "master", default-features = false }
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[profile.release]
+debug = 1
+
+[[bin]]
+name = "fuzz_force_checkpoint"
+path = "fuzz_targets/fuzz_force_checkpoint.rs"
+test = false
+doc = false
+
+[[bin]]
+name = "fuzz_submit"
+path = "fuzz_targets/fuzz_submit.rs"
+test = false
+doc = false
+
+[[bin]]
+name = "fuzz_submit_execution_header"
+path = "fuzz_targets/fuzz_submit_execution_header.rs"
+test = false
+doc = false
diff --git a/parachain/pallets/ethereum-beacon-client/fuzz/README.md b/parachain/pallets/ethereum-beacon-client/fuzz/README.md
new file mode 100644
index 0000000000000..62de4c4116b80
--- /dev/null
+++ b/parachain/pallets/ethereum-beacon-client/fuzz/README.md
@@ -0,0 +1,21 @@
+# Beacon client fuzz tests
+
+This crate contains fuzz tests for the three beacon client extrinsics.
+
+# Installation
+
+```
+cargo install cargo-fuzz
+```
+
+# Run tests
+
+- Force Checkpoint: `cargo fuzz run fuzz_force_checkpoint -- -max_len=10000000000`
+- Submit: `cargo fuzz run fuzz_submit -- -max_len=10000000000`
+- Submit Execution Header: `cargo fuzz run fuzz_submit_execution_header -- -max_len=10000000000`
+
+Note: `max-len` is necessary because the max input length is 4096 bytes. Some of our inputs are larger than this
+default value. When running the tests without an increased max len parameter, no fuzz data will be generated.
+
+The tests will keep running until a crash is found, so in our CI setup the number of runs is limited so that the 
+test completes.
diff --git a/parachain/pallets/ethereum-beacon-client/fuzz/fuzz_targets/fuzz_force_checkpoint.rs b/parachain/pallets/ethereum-beacon-client/fuzz/fuzz_targets/fuzz_force_checkpoint.rs
new file mode 100644
index 0000000000000..32808697e15ad
--- /dev/null
+++ b/parachain/pallets/ethereum-beacon-client/fuzz/fuzz_targets/fuzz_force_checkpoint.rs
@@ -0,0 +1,16 @@
+#![no_main]
+extern crate snowbridge_ethereum_beacon_client;
+
+use libfuzzer_sys::fuzz_target;
+use snowbridge_ethereum_beacon_client::{mock::minimal::*, types::CheckpointUpdate};
+use snowbridge_ethereum_beacon_client_fuzz::types::FuzzCheckpointUpdate;
+use std::convert::TryInto;
+
+fuzz_target!(|input: FuzzCheckpointUpdate| {
+	new_tester().execute_with(|| {
+		let update: CheckpointUpdate = input.try_into().unwrap();
+		let result =
+			EthereumBeaconClient::force_checkpoint(RuntimeOrigin::root(), Box::new(update));
+		assert!(result.is_err());
+	});
+});
diff --git a/parachain/pallets/ethereum-beacon-client/fuzz/fuzz_targets/fuzz_submit.rs b/parachain/pallets/ethereum-beacon-client/fuzz/fuzz_targets/fuzz_submit.rs
new file mode 100644
index 0000000000000..fd6c5431be171
--- /dev/null
+++ b/parachain/pallets/ethereum-beacon-client/fuzz/fuzz_targets/fuzz_submit.rs
@@ -0,0 +1,16 @@
+#![no_main]
+extern crate snowbridge_ethereum_beacon_client;
+
+use snowbridge_ethereum_beacon_client::{mock::minimal::*, types::Update};
+use snowbridge_ethereum_beacon_client_fuzz::types::FuzzUpdate;
+use std::convert::TryInto;
+
+use libfuzzer_sys::fuzz_target;
+
+fuzz_target!(|input: FuzzUpdate| {
+	new_tester().execute_with(|| {
+		let update: Update = input.try_into().unwrap();
+		let result = EthereumBeaconClient::submit(RuntimeOrigin::signed(1), Box::new(update));
+		assert!(result.is_err());
+	});
+});
diff --git a/parachain/pallets/ethereum-beacon-client/fuzz/fuzz_targets/fuzz_submit_execution_header.rs b/parachain/pallets/ethereum-beacon-client/fuzz/fuzz_targets/fuzz_submit_execution_header.rs
new file mode 100644
index 0000000000000..b1f9b994c1fcd
--- /dev/null
+++ b/parachain/pallets/ethereum-beacon-client/fuzz/fuzz_targets/fuzz_submit_execution_header.rs
@@ -0,0 +1,19 @@
+#![no_main]
+extern crate snowbridge_ethereum_beacon_client;
+
+use snowbridge_beacon_primitives::ExecutionHeaderUpdate;
+use snowbridge_ethereum_beacon_client::mock::minimal::*;
+use snowbridge_ethereum_beacon_client_fuzz::types::FuzzExecutionHeaderUpdate;
+
+use libfuzzer_sys::fuzz_target;
+
+fuzz_target!(|input: FuzzExecutionHeaderUpdate| {
+	new_tester().execute_with(|| {
+		let update: ExecutionHeaderUpdate = input.try_into().unwrap();
+		let result = EthereumBeaconClient::submit_execution_header(
+			RuntimeOrigin::signed(1),
+			Box::new(update),
+		);
+		assert!(result.is_err());
+	});
+});
diff --git a/parachain/pallets/ethereum-beacon-client/fuzz/src/impls.rs b/parachain/pallets/ethereum-beacon-client/fuzz/src/impls.rs
new file mode 100644
index 0000000000000..12062d73d28a7
--- /dev/null
+++ b/parachain/pallets/ethereum-beacon-client/fuzz/src/impls.rs
@@ -0,0 +1,220 @@
+use crate::types::{
+	FuzzAncestryProof, FuzzBeaconHeader, FuzzCheckpointUpdate, FuzzExecutionHeaderUpdate,
+	FuzzExecutionPayloadHeader, FuzzNextSyncCommitteeUpdate, FuzzSyncAggregate, FuzzSyncCommittee,
+	FuzzUpdate,
+};
+use arbitrary::{Arbitrary, Result, Unstructured};
+use libfuzzer_sys::arbitrary;
+use snowbridge_beacon_primitives::{
+	types::BeaconHeader, updates::AncestryProof, ExecutionHeaderUpdate, ExecutionPayloadHeader,
+	PublicKey,
+};
+use snowbridge_ethereum_beacon_client::types::{
+	CheckpointUpdate, NextSyncCommitteeUpdate, SyncAggregate, SyncCommittee, Update,
+};
+use sp_core::H256;
+use std::convert::TryInto;
+
+impl TryFrom<FuzzUpdate> for Update {
+	type Error = String;
+
+	fn try_from(other: FuzzUpdate) -> Result<Self, Self::Error> {
+		let next: Option<NextSyncCommitteeUpdate> = other
+			.next_sync_committee_update
+			.map(|fuzz_update| fuzz_update.try_into().unwrap());
+
+		Ok(Self {
+			attested_header: other.attested_header.clone().try_into().unwrap(),
+			sync_aggregate: other.sync_aggregate.try_into().unwrap(),
+			signature_slot: other.signature_slot,
+			next_sync_committee_update: next,
+			finalized_header: other.finalized_header.clone().try_into().unwrap(),
+			finality_branch: other
+				.finality_branch
+				.iter()
+				.map(|&hash| H256::from(hash))
+				.collect::<Vec<_>>()
+				.as_slice()
+				.try_into()
+				.unwrap(),
+			block_roots_root: other.block_roots_root.into(),
+			block_roots_branch: other
+				.block_roots_branch
+				.iter()
+				.map(|&hash| H256::from(hash))
+				.collect::<Vec<_>>()
+				.as_slice()
+				.try_into()
+				.unwrap(),
+		})
+	}
+}
+
+impl TryFrom<FuzzNextSyncCommitteeUpdate> for NextSyncCommitteeUpdate {
+	type Error = String;
+
+	fn try_from(other: FuzzNextSyncCommitteeUpdate) -> Result<Self, Self::Error> {
+		Ok(Self {
+			next_sync_committee: other.next_sync_committee.try_into().unwrap(),
+			next_sync_committee_branch: other
+				.next_sync_committee_branch
+				.iter()
+				.map(|&hash| H256::from(hash))
+				.collect::<Vec<_>>()
+				.as_slice()
+				.try_into()
+				.unwrap(),
+		})
+	}
+}
+
+impl TryFrom<FuzzSyncAggregate> for SyncAggregate {
+	type Error = String;
+
+	fn try_from(other: FuzzSyncAggregate) -> Result<Self, Self::Error> {
+		Ok(Self {
+			sync_committee_bits: other.sync_committee_bits.into(),
+			sync_committee_signature: other.sync_committee_signature.into(),
+		})
+	}
+}
+
+impl TryFrom<FuzzCheckpointUpdate> for CheckpointUpdate {
+	type Error = String;
+
+	fn try_from(other: FuzzCheckpointUpdate) -> Result<Self, Self::Error> {
+		Ok(Self {
+			header: other.header.clone().try_into().unwrap(),
+			current_sync_committee: other.current_sync_committee.try_into().unwrap(),
+			current_sync_committee_branch: other
+				.current_sync_committee_branch
+				.iter()
+				.map(|&hash| H256::from(hash))
+				.collect::<Vec<_>>()
+				.as_slice()
+				.try_into()
+				.unwrap(),
+			validators_root: other.validators_root.into(),
+			block_roots_root: other.block_roots_root.into(),
+			block_roots_branch: other
+				.block_roots_branch
+				.iter()
+				.map(|&hash| H256::from(hash))
+				.collect::<Vec<_>>()
+				.as_slice()
+				.try_into()
+				.unwrap(),
+		})
+	}
+}
+
+impl TryFrom<FuzzSyncCommittee> for SyncCommittee {
+	type Error = String;
+
+	fn try_from(other: FuzzSyncCommittee) -> Result<Self, Self::Error> {
+		Ok(Self {
+			pubkeys: other
+				.pubkeys
+				.iter()
+				.map(|&pk| { pk.into() })
+				.collect::<Vec<PublicKey>>()
+				.as_slice()
+				.try_into()
+				.unwrap(),
+			aggregate_pubkey: other.aggregate_pubkey.into(),
+		})
+	}
+}
+
+impl TryFrom<FuzzAncestryProof> for AncestryProof {
+	type Error = String;
+
+	fn try_from(other: FuzzAncestryProof) -> Result<Self, Self::Error> {
+		Ok(Self {
+			header_branch: other
+				.header_branch
+				.iter()
+				.map(|&hash| H256::from(hash))
+				.collect::<Vec<_>>()
+				.as_slice()
+				.try_into()
+				.unwrap(),
+			finalized_block_root: other.finalized_block_root.into(),
+		})
+	}
+}
+
+impl TryFrom<FuzzExecutionPayloadHeader> for ExecutionPayloadHeader {
+	type Error = String;
+
+	fn try_from(other: FuzzExecutionPayloadHeader) -> Result<Self, Self::Error> {
+		Ok(Self {
+			parent_hash: other.parent_hash.into(),
+			fee_recipient: other.fee_recipient.into(),
+			state_root: other.state_root.into(),
+			receipts_root: other.receipts_root.into(),
+			logs_bloom: other.logs_bloom.into(),
+			prev_randao: other.prev_randao.into(),
+			block_number: other.block_number,
+			gas_limit: other.gas_limit,
+			gas_used: other.gas_used,
+			timestamp: other.timestamp,
+			extra_data: other.extra_data.into(),
+			base_fee_per_gas: other.base_fee_per_gas.into(),
+			block_hash: other.block_hash.into(),
+			transactions_root: other.transactions_root.into(),
+			withdrawals_root: other.withdrawals_root.into(),
+		})
+	}
+}
+
+impl TryFrom<FuzzBeaconHeader> for BeaconHeader {
+	type Error = String;
+
+	fn try_from(other: FuzzBeaconHeader) -> Result<Self, Self::Error> {
+		Ok(Self {
+			slot: other.slot,
+			proposer_index: other.proposer_index,
+			parent_root: other.parent_root.into(),
+			state_root: other.state_root.into(),
+			body_root: other.body_root.into(),
+		})
+	}
+}
+
+impl TryFrom<FuzzExecutionHeaderUpdate> for ExecutionHeaderUpdate {
+	type Error = String;
+
+	fn try_from(other: FuzzExecutionHeaderUpdate) -> Result<Self, Self::Error> {
+		let ancestry_proof: Option<AncestryProof> =
+			other.ancestry_proof.map(|fuzz_update| fuzz_update.try_into().unwrap());
+
+		Ok(Self {
+			header: other.header.try_into().unwrap(),
+			ancestry_proof,
+			execution_header: other.execution_header.try_into().unwrap(),
+			execution_branch: other
+				.execution_branch
+				.iter()
+				.map(|&hash| H256::from(hash))
+				.collect::<Vec<_>>()
+				.as_slice()
+				.try_into()
+				.unwrap(),
+		})
+	}
+}
+
+// The arbitrary derive implementation is super slow for the pubkey set, so create a custom
+// impl for the sync committee.
+impl Arbitrary<'_> for FuzzSyncCommittee {
+	fn arbitrary(u: &mut Unstructured<'_>) -> Result<Self> {
+		let mut pubkeys = [[0u8; 48]; 32];
+
+		for i in 0..32 {
+			pubkeys[i] = <[u8; 48]>::arbitrary(u)?;
+		}
+
+		Ok(FuzzSyncCommittee { pubkeys, aggregate_pubkey: <[u8; 48]>::arbitrary(u)? })
+	}
+}
diff --git a/parachain/pallets/ethereum-beacon-client/fuzz/src/lib.rs b/parachain/pallets/ethereum-beacon-client/fuzz/src/lib.rs
new file mode 100644
index 0000000000000..fb880c01820a5
--- /dev/null
+++ b/parachain/pallets/ethereum-beacon-client/fuzz/src/lib.rs
@@ -0,0 +1,2 @@
+pub mod impls;
+pub mod types;
diff --git a/parachain/pallets/ethereum-beacon-client/fuzz/src/types.rs b/parachain/pallets/ethereum-beacon-client/fuzz/src/types.rs
new file mode 100644
index 0000000000000..37e5eb0d6c4b4
--- /dev/null
+++ b/parachain/pallets/ethereum-beacon-client/fuzz/src/types.rs
@@ -0,0 +1,83 @@
+use libfuzzer_sys::arbitrary;
+
+#[derive(arbitrary::Arbitrary, Debug, Clone)]
+pub struct FuzzCheckpointUpdate {
+	pub header: FuzzBeaconHeader,
+	pub current_sync_committee: FuzzSyncCommittee,
+	pub current_sync_committee_branch: Vec<[u8; 32]>,
+	pub validators_root: [u8; 32],
+	pub block_roots_root: [u8; 32],
+	pub block_roots_branch: Vec<[u8; 32]>,
+}
+
+#[derive(arbitrary::Arbitrary, Debug, Clone)]
+pub struct FuzzBeaconHeader {
+	pub slot: u64,
+	pub proposer_index: u64,
+	pub parent_root: [u8; 32],
+	pub state_root: [u8; 32],
+	pub body_root: [u8; 32],
+}
+
+#[derive(Debug, Clone)]
+pub struct FuzzSyncCommittee {
+	pub pubkeys: [[u8; 48]; 32],
+	pub aggregate_pubkey: [u8; 48],
+}
+
+#[derive(arbitrary::Arbitrary, Debug, Clone)]
+pub struct FuzzUpdate {
+	pub attested_header: FuzzBeaconHeader,
+	pub sync_aggregate: FuzzSyncAggregate,
+	pub signature_slot: u64,
+	pub next_sync_committee_update: Option<FuzzNextSyncCommitteeUpdate>,
+	pub finalized_header: FuzzBeaconHeader,
+	pub finality_branch: Vec<[u8; 32]>,
+	pub block_roots_root: [u8; 32],
+	pub block_roots_branch: Vec<[u8; 32]>,
+}
+
+#[derive(arbitrary::Arbitrary, Debug, Clone)]
+pub struct FuzzSyncAggregate {
+	pub sync_committee_bits: [u8; 4],
+	pub sync_committee_signature: [u8; 96],
+}
+
+#[derive(arbitrary::Arbitrary, Debug, Clone)]
+pub struct FuzzNextSyncCommitteeUpdate {
+	pub next_sync_committee: FuzzSyncCommittee,
+	pub next_sync_committee_branch: Vec<[u8; 32]>,
+}
+
+#[derive(arbitrary::Arbitrary, Debug, Clone)]
+pub struct FuzzExecutionHeaderUpdate {
+	pub header: FuzzBeaconHeader,
+	pub ancestry_proof: Option<FuzzAncestryProof>,
+	pub execution_header: FuzzExecutionPayloadHeader,
+	pub execution_branch: Vec<[u8; 32]>,
+}
+
+#[derive(arbitrary::Arbitrary, Debug, Clone)]
+pub struct FuzzAncestryProof {
+	pub header_branch: Vec<[u8; 32]>,
+	pub finalized_block_root: [u8; 32],
+}
+
+#[derive(arbitrary::Arbitrary, Debug, Clone)]
+pub struct FuzzExecutionPayloadHeader {
+	pub parent_hash: [u8; 32],
+	pub fee_recipient: [u8; 20],
+	pub state_root: [u8; 32],
+	pub receipts_root: [u8; 32],
+	pub logs_bloom: Vec<u8>,
+	pub prev_randao: [u8; 32],
+	pub block_number: u64,
+	pub gas_limit: u64,
+	pub gas_used: u64,
+	pub timestamp: u64,
+	pub extra_data: Vec<u8>,
+	pub base_fee_per_gas: [u8; 32],
+	pub block_hash: [u8; 32],
+	pub transactions_root: [u8; 32],
+	pub withdrawals_root: [u8; 32],
+}
diff --git a/parachain/pallets/ethereum-beacon-client/src/lib.rs b/parachain/pallets/ethereum-beacon-client/src/lib.rs
index f13ca32766006..12f4bb1526773 100644
--- a/parachain/pallets/ethereum-beacon-client/src/lib.rs
+++ b/parachain/pallets/ethereum-beacon-client/src/lib.rs
@@ -9,8 +9,9 @@ pub mod impls;
 pub mod types;
 pub mod weights;
 
-#[cfg(test)]
-mod mock;
+#[cfg(any(test, feature = "fuzzing"))]
+pub mod mock;
+
 #[cfg(all(test, not(feature = "beacon-spec-mainnet")))]
 mod tests;
 
diff --git a/scripts/init.sh b/scripts/init.sh
index 7d2259852ae68..ab86e427c0e7c 100755
--- a/scripts/init.sh
+++ b/scripts/init.sh
@@ -15,5 +15,8 @@ rustup component add --toolchain nightly-"$SNOWBRIDGE_RUST_NIGHTLY" rustfmt
 echo "Installing sszgen"
 go install github.com/ferranbt/fastssz/sszgen@v0.1.3
 
+echo "Installing cargo fuzz"
+cargo install cargo-fuzz
+
 echo "Installing web packages"
 (cd web && pnpm install)