Restricted file disclosure via unresolved symlinks
Published Jan 7, 2026 · Updated Jan 7, 2026
Path traversal in fast-filesystem-mcp 3.4.0 and earlier allows remote attackers to read restricted files through permitted symlinks. The safePath and isPathAllowed functions apply path.resolve() and a prefix check without resolving the link target before fs.open() follows it. Exploitation requires a symlink inside an allowed directory that targets an otherwise restricted path, exposing file contents without reported write or service impact.
Summary
What happened
Path traversal in fast-filesystem-mcp 3.4.0 and earlier allows remote attackers to read restricted files through permitted symlinks. The safePath and isPathAllowed functions apply path.resolve() and a prefix check without resolving the link target before fs.open() follows it. Exploitation requires a symlink inside an allowed directory that targets an otherwise restricted path, exposing file contents without reported write or service impact.
The record
- CVE
- CVE-2025-67364
- Published
- Jan 7, 2026
- Updated
- Jan 7, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-24, T1005
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 7, 2026CVE publishedPublication date reported by the CVE source.
- Jan 7, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- Security Vulnerability: Path Validation Bypass via Symlinks in File Operationsproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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