diff --git a/CHANGELOG.md b/CHANGELOG.md
index 37cebbf8535..652941b92de 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -46,6 +46,7 @@ This v0.38.12 branch was created at the [cf7836ad7b63bc1421deed23beb8630a3705b5d
 * [#142](https://github.com/osmosis-labs/cometbft/pull/142) feat(p2p): render HasChannel(chID) is a public p2p.Peer method (#3510) #142
 * [#143](https://github.com/osmosis-labs/cometbft/pull/143) fix: comment out expensive debug logs #143
 * [#f2f9426](https://github.com/osmosis-labs/cometbft/commit/f2f9426c6985f2ea63ceb879c26858cf7f42f186) perf(blocksync): Parallelize logic for receiving a block from a peer. (backport cometbft#3554) (cometbft#3592)
+* [#150](https://github.com/osmosis-labs/cometbft/pull/150) fix: copy TxIndex TxBytes value 
 
 ## v26
 
diff --git a/state/txindex/kv/kv.go b/state/txindex/kv/kv.go
index d305acbdd23..e7881a79fe4 100644
--- a/state/txindex/kv/kv.go
+++ b/state/txindex/kv/kv.go
@@ -396,12 +396,17 @@ type TxInfo struct {
 }
 
 func (*TxIndex) setTmpHashes(tmpHeights map[string]TxInfo, key, value []byte, height int64) {
+	// value comes from cometbft-db Iterator interface Value() API.
+	// Therefore, we must make a copy before storing references to it.
+	valueCp := make([]byte, len(value))
+	copy(valueCp, value)
+
 	eventSeq := extractEventSeqFromKey(key)
 	txInfo := TxInfo{
-		TxBytes: value,
+		TxBytes: valueCp,
 		Height:  height,
 	}
-	tmpHeights[string(value)+eventSeq] = txInfo
+	tmpHeights[string(valueCp)+eventSeq] = txInfo
 }
 
 // match returns all matching txs by hash that meet a given condition and start