CVE-2026-25724
LOW
GHSA-4q92-rfm6-2cqx
CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3Description
Claude Code is an agentic coding tool. Prior to version 2.1.7, Claude Code failed to strictly enforce deny rules configured in settings.json when accessing files through symbolic links. If a user explicitly denied Claude Code access to a file (such as /etc/passwd) and Claude Code had access to a symbolic link pointing to that file, it was possible for Claude Code to read the restricted file through the symlink without triggering deny rule enforcement. This issue has been patched in version 2.1.7.
Analysis
Claude Code versions prior to 2.1.7 allow unauthorized file access by bypassing deny rules through symbolic link traversal, enabling attackers to read restricted files that administrators explicitly blocked. An attacker with access to the system can exploit this vulnerability to access sensitive files like /etc/passwd by leveraging symlinks that point to denied resources. …
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Remediation
Within 24 hours: Identify all Claude Code deployments and document current versions in use. Within 7 days: Implement network segmentation to restrict Claude Code access to non-sensitive file systems; disable Claude Code symbolic link functionality if available in settings. …
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External POC / Exploit Code
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