How severe is CVE-2025-67366?

CVE-2025-67366 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-67366 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-67366?

CVE-2025-67366 affects Sylphx Filesystem-mcp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-67366?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-67366 have an EU (EUVD) identifier?

Yes. CVE-2025-67366 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1202.

When was CVE-2025-67366 published?

CVE-2025-67366 was published on 2026-01-07 and last updated on 2026-06-17.

CVE-2025-67366

CVE-2025-67366 is a high-severity vulnerability in Sylphx Filesystem-mcp with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-23.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-1202
Weakness: CWE-23
Affected product: Sylphx Filesystem-mcp
Published: 2026-01-07
Last modified: 2026-06-17

Description

@sylphxltd/filesystem-mcp v0.5.8 is an MCP server that provides file content reading functionality. Version 0.5.8 of filesystem-mcp contains a critical path traversal vulnerability in its "read_content" tool. This vulnerability arises from improper symlink handling in the path validation mechanism: the resolvePath function checks path validity before resolving symlinks, while fs.readFile resolves symlinks automatically during file access. This allows attackers to bypass directory restrictions by leveraging symlinks within the allowed directory that point to external files, enabling unauthorized access to files outside the intended operational scope.

Frequently asked questions

What is CVE-2025-67366?: @sylphxltd/filesystem-mcp v0.5.8 is an MCP server that provides file content reading functionality. Version 0.5.8 of filesystem-mcp contains a critical path traversal vulnerability in its "read_content" tool. This vulnerability arises from improper symlink handling in the path validation mechanism: the resolvePath function checks path validity before resolving symlinks, while fs.readFile resolves symlinks automatically during file access. This allows attackers to bypass directory restrictions by leveraging symlinks within the allowed directory that point to external files, enabling unauthorized access to files outside the intended operational scope.
How severe is CVE-2025-67366?: CVE-2025-67366 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-67366 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-67366?: CVE-2025-67366 affects Sylphx Filesystem-mcp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-67366?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-67366 have an EU (EUVD) identifier?: Yes. CVE-2025-67366 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1202.
When was CVE-2025-67366 published?: CVE-2025-67366 was published on 2026-01-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:sylphx:filesystem-mcp:0.5.8:*:*:*:*:node.js:*:*

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