CVE-2025-59829: Claude Code permission deny bypass through symlink

October 3, 2025

Claude Code 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.

Thank you to https://hackerone.com/vinai for reporting this issue!

References

github.com/advisories/GHSA-66m2-gx93-v996
github.com/anthropics/claude-code
github.com/anthropics/claude-code/security/advisories/GHSA-66m2-gx93-v996
nvd.nist.gov/vuln/detail/CVE-2025-59829

Code Behaviors & Features

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