CVE-2025-67366: @sylphxltd/filesystem-mcp v0.5.8 is an MCP server that provides file content reading functionality

Q: How do I fix CVE-2025-67366?

filesystem mcp: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2025-67366 being exploited?

CVE-2025-67366 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-67366 affect?

CVE-2025-67366 affects filesystem mcp. Severity is high (CVSS 7.5). @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

Q: How urgent is CVE-2025-67366?

Priority 49/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2025-67366 is a high-severity flaw (CVSS 7.5) affecting filesystem mcp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

@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 al

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-23
Published	2026-01-07
Last modified	2026-09-16

Publisher (CNA): MITRE · Vendor: sylphx

Last updated 2026-09-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-07 17:16 UTCPublished CVE record published
2026-09-16 18:21 UTCUpdated Record last modified

sylphx filesystem mcp DOWNGRADE

Affected: 0.5.8

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.5.8

1. Check installed version

npm ls filesystem-mcp

2. No fixed release: DOWNGRADE to a release before 0.5.8

npm view filesystem-mcp versions npm install filesystem-mcp@"<0.5.8"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-67366?

filesystem mcp: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-67366 being exploited?

CVE-2025-67366 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-67366 affect?

CVE-2025-67366 affects filesystem mcp. Severity is high (CVSS 7.5). @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

How urgent is CVE-2025-67366?

Priority 49/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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