CVE-2025-59828
Claude Code Vulnerable to Arbitrary Code Execution via Plugin Autoloading with Specific Yarn Versions
In short
Claude Code automatically executed Yarn plugins before asking users to trust a directory, allowing attackers to run malicious code without permission. This vulnerability only affected Yarn 2.0+ users and has been fixed in version 1.0.39.
Technical detail
The vulnerability exploits Yarn 2.0+ plugin autoloading mechanism triggered by yarn --version command execution. Claude Code invoked this command before presenting the directory trust dialog to users, allowing pre-execution of arbitrary plugins stored in untrusted directories. An attacker could craft a malicious Yarn configuration to execute code with the user's privileges before consent is obtained.
Summary generated and translated by AI from the official description.
Claude Code is an agentic coding tool. Prior to Claude Code version 1.0.39, when using Claude Code with Yarn versions 2.0+, Yarn plugins are auto-executed when running yarn --version. This could lead to a bypass of the directory trust dialog in Claude Code, as plugins would be executed prior to the user accepting the risks of working in an untrusted directory. Users running Yarn Classic were unaffected by this issue. This issue has been fixed in version 1.0.39. 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.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
anthropics · claude-codeWant to know if your infrastructure is exposed to this?
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