CVE-2025-67364: fast-filesystem-mcp version 3.4.0 contains a critical path traversal vulnerability in its file operation tools

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HIGH 7.5REMOTEDOWNGRADE

CVE-2025-67364 is a high-severity flaw (CVSS 7.5) affecting fast-filesystem-mcp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 d

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-24
Published	2026-01-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: efforthye

Last updated 2026-06-17 · 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
2026-06-17 09:57 UTCUpdated Record last modified

efforthye fast-filesystem-mcp DOWNGRADE

Affected: 3.4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.4.0

1. Check installed version

apt-cache policy fast-filesystem-mcp || rpm -q fast-filesystem-mcp || fast-filesystem-mcp --version

2. No fixed release: DOWNGRADE to a release before 3.4.0 (Debian / Ubuntu)

apt-cache madison fast-filesystem-mcp sudo apt install fast-filesystem-mcp=<VERSION_BEFORE_3.4.0> sudo apt-mark hold fast-filesystem-mcp

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list fast-filesystem-mcp sudo dnf downgrade fast-filesystem-mcp-<VERSION_BEFORE_3.4.0> sudo dnf versionlock add fast-filesystem-mcp

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-2025-67364?

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

Is CVE-2025-67364 being exploited?

CVE-2025-67364 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-2025-67364 affect?

CVE-2025-67364 affects fast-filesystem-mcp. Severity is high (CVSS 7.5). 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 a

How urgent is CVE-2025-67364?

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

References

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