CVE-2025-59829: Claude Code: Permission deny bypass is possible through symlink

Vulnerability summary

CVE-2025-59829 is a medium (CVSS 6.5) UNIX Symbolic Link (Symlink) Following vulnerability in anthropic claude_code. EPSS estimates a 0.45% chance of exploitation in the next 30 days, higher than 37.8% of scored vulnerabilities.

Timeline

1. 03-10-2025
   PublishedVulnerability first disclosed.
2. 03-10-2025
   Last modifiedVulnerability information updated.

Description

Claude Code is an agentic coding tool. Versions below 1.0.120 failed to account for symlinks when checking permission deny rules. If a user explicitly denied Claude Code access to a file and Claude Code had access to a symlink pointing to that file, it was possible for Claude Code to access the file. 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. This issue is fixed in version 1.0.120.

• CWE-61UNIX Symbolic Link (Symlink) FollowingThe product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files.