CVE-2026-79534
MediumCVSS 5.9Exploitation Probability (EPSS)
Low risk8th percentile - higher than 8% of all known CVEs
Summary
Directory Traversal vulnerability in mcp-filesystem-server v0.11.1 due to improper link resolution in validatePath. When EvalSymlinks returns os.IsNotExist for a dangling symlink, the fallback validates only the parent directory and returns the unresolved path, allowing file writes outside allowed directories.
Risk Assessment
An attacker can write, modify, or copy files outside allowed directories, leading to filesystem integrity compromise.
Recommendation
Update mcp-filesystem-server to the latest version and fix path validation logic.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

