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CVE WatchSep 29, 2026

CVE-2026-79534

mark3labs mcp-filesystem-server v0.11.1 is vulnerable to Directory Traversal due to an improper link resolution in validatePath (filesystems

CVSS

—

No CVSS

EPSS

0.2%

p9

KEV

—

Exploit Today

3

0-100

Published: Sep 29, 2026 · Last modified: Sep 29, 2026

EPSS · 30d
0.2%EPSS · 30 days0.2%
2026-09-302026-10-19
Technical 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.

Official references
Related CVEs

No related CVEs by CWE or product.