CVE-2026-79534

State: Published
Severity: 5.9 Medium
Published: Sep 29, 2026
Updated: Sep 30, 2026
Reserved: Aug 25, 2026

Description

mark3labs mcp-filesystem-server v0.11.1 is vulnerable to Directory Traversal due to an improper link resolution in validatePath (filesystemserver/handler/helper.go). When filepath.EvalSymlinks returns os.IsNotExist for a dangling symlink, the fallback validates only the parent directory and returns the unresolved path, so write_file (and modify_file, copy_file, move_file, create_directory) follows a pre-existing dangling symlink located inside an allowed directory and creates a file outside the configured allowed directories.

Scores

CVSS	Score	Vector	Source
3.1	5.9 Medium	CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N	CISA-ADP

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-59 Improper Link Resolution Before File Access ('Link Following')

Affected Products

Product	Versions
n/an/a	n/aAffected

References

https://www.traceforce.ai/security-advisories/cve-2026-79534

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