AI agent vulnerability · Claude Code

CVE-2025-59828: Claude Code Vulnerable to Arbitrary Code Execution via Plugin Autoloading with Specific Yarn Versions

highCVSS 4.0 7.7GHSA-2jjv-qf24-vfm4

When using Claude Code with Yarn installed, Yarn config files can trigger code execution when running yarn --version. This could lead to a bypass of the directory trust dialog in Claude Code, as plugins and yarnPath could be executed prior to the user accepting the risks of working in an untrusted directory. Users on standard Claude Code auto-update will have received this fix automatically.

Published Sep 24, 2025 · Updated Dec 22, 2025

Affected packages

@anthropic-ai/claude-code

Ecosystem: npm
Affected: < 1.0.39
Fixed in: 1.0.39
Check: npm ls @anthropic-ai/claude-code

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

When using Claude Code with Yarn installed, Yarn config files can trigger code execution when running yarn --version. This could lead to a bypass of the directory trust dialog in Claude Code, as plugins and yarnPath could be executed prior to the user accepting the risks of working in an untrusted directory. Users on standard Claude Code auto-update will have received this fix automatically. Users performing manual updates are advised to update to the latest version.

Thank you to Benjamin Faller, Redguard AG and Michael Hess for reporting this issue!

Credited to cai0duque.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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