CVE-2025-59828highCWE-829CWE-862

CVE-2025-59828: high-severity vulnerability in anthropics claude-code

Claude Code Vulnerable to Arbitrary Code Execution via Plugin Autoloading with Specific Yarn Versions

Published

Follow this CVE+ Monitor claude-code+ Monitor @anthropic-ai/claude-code

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.7epss 0.4%
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-code
Related CVEs — anthropics claude-code

In the same product, most dangerous first.

CVE-2026-21852MEDIUMClaude Code Leaks Data via Malicious Environment Configuration Before Trust ConfirmationEPSS 27.5%CVE-2025-59536HIGHClaude Code's startup trust dialog could lead to Command Execution attackEPSS 24.9%CVE-2025-54794HIGHClaude Code Research Preview has a Path Restriction Bypass which could allow unauthorized file accessEPSS 1.5%CVE-2025-54795HIGHClaude Code echo command allowed bypass of user approval prompt for command executionEPSS 1.1%CVE-2025-66032HIGHClaude Code Command Validation Bypass Allows Arbitrary Code ExecutionEPSS 0.7%CVE-2026-39861HIGHClaude Code: Sandbox Escape via Symlink Following Allows Arbitrary File Write Outside WorkspaceEPSS 0.7%