CVE-2025-67364 json
fast-filesystem-mcp has a Path Traversal vulnerability
published 2026-01-07 10 mo ago modified 2026-11-04 4 d ago also GHSA-j893-m93w-jwjw , EUVD-2026-1195
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 50%
- public exploits
- 0
- none known
Summary
fast-filesystem-mcp version 3.4.0 contains a critical path traversal vulnerability in its file operation tools including fast_read_file. This vulnerability arises from improper path validation that fails to resolve symbolic links to their actual physical paths. The safePath and isPathAllowed functions use path.resolve() which does not handle symlinks, allowing attackers to bypass directory access restrictions by creating symlinks within allowed directories that point to restricted system paths. When these symlinks are accessed through valid path references, the validation checks are circumvented, enabling access to unauthorized files.
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 10 mo ago
Exploit prediction
0.63% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/efforthye/fast-filesystem-mcp/issues/10 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | fast-filesystem-mcp | <=3.4.0 |
no fix listed |
Classification
- Weakness
-
- CWE-24 Path Traversal: '../filedir'
References
-
github.com
/efforthye/fast-filesystem-mcp/issues/10
web, exploit, issue-tracking
-
github.com
/efforthye/fast-filesystem-mcp
package, product
-
nvd.nist.gov
/vuln/detail/CVE-2025-67364
advisory
Sources
- CVE List CVE-2025-67364
- GitHub Advisory GHSA-j893-m93w-jwjw
- NVD CVE-2025-67364
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