UNIX symbolic link following in Claude Code - CVE-2025-59829
Published: April 30, 2026
Vulnerability identifier: #VU128523
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-59829
CWE-ID: CWE-61
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Claude Code
Claude Code
Software vendor:
Anthropic
Anthropic
Description
The vulnerability allows a remote attacker to access denied files through a symlink.
The vulnerability exists due to unix symbolic link following in permission deny rule checks when resolving access to a symlink pointing to a denied file. A remote attacker can provide or use a symlink to a denied file to access denied files through a symlink.
User interaction is required.
Remediation
Install security update from vendor's website.