SB2026043042 - UNIX symbolic link following in Claude Code
Published: April 30, 2026
Security Bulletin ID
SB2026043042
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) UNIX symbolic link following (CVE-ID: CVE-2025-59829)
CWE-ID: CWE-61 - UNIX Symbolic Link (Symlink) Following
CVSSv4: 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
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 update from vendor's website.