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

When using Claude Code with Yarn installed, Yarn config files can trigger code execution when running yarn --version.

01.

What it is

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.

02.

How to check

Affected: @anthropic-ai/claude-code (npm) < 1.0.39.
Compare your installed version with the range above (command below).

03.

How to fix

Upgrade @anthropic-ai/claude-code to 1.0.39 or later.

npm ls @anthropic-ai/claude-code -g   # or: claude --version

04.

Sources

More advisories for this tool