PyYAML insecurely deserializes YAML strings leading to arbitrary code execution · CVE-2017-18342 · GitHub Advisory Database · GitHub

PyYAML insecurely deserializes YAML strings leading to arbitrary code execution

Critical severity GitHub Reviewed Published Jan 4, 2019 to the GitHub Advisory Database • Updated Sep 5, 2023

Package

pyyaml (pip)

Affected versions

< 4.1

Patched versions

4.1

Description

In PyYAML before 4.1, the yaml.load() API could execute arbitrary code. In other words, yaml.safe_load is not used.

References

Published to the GitHub Advisory Database Jan 4, 2019

Reviewed Jun 16, 2020

Last updated Sep 5, 2023

Severity

Critical

9.8

/ 10

CVSS base metrics

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H