CVE-2025-53109

Model Context Protocol Servers Vulnerable to Path Validation Bypass via Prefix Matching and Symlink Handling

7.3 HighFix available

Model Context Protocol Servers is a collection of reference implementations for the model context protocol (MCP). Versions of Filesystem prior to 0.6.4 or 2025.7.01 could allow access to unintended files via symlinks within allowed directories. Users are advised to upgrade to 0.6.4 or 2025.7.01 resolve.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Passive

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.77%Up 0.7 points since Jul 3, 2025

What each source reports

CVE List Score used 7.3

Model Context Protocol Servers Vulnerable to Path Validation Bypass via Prefix Matching and Symlink Handling

Record: CVE-2025-53109
CVSS 4.0: 7.3 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:H/SI:H/SA:H
Weakness: CWE-59
Updated: 2026-11-02

EUVDEUVD-2025-19730 7.3

Record: EUVD-2025-19730
CVSS 4.0: 7.3 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:H/SI:H/SA:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-q66q-fx2p-7w4m 7.3

@modelcontextprotocol/server-filesystem allows for path validation bypass via prefix matching and symlink handling

Versions of Filesystem prior to 0.6.3 & 2025.7.1 could allow access to unintended files via symlinks within allowed directories. Users are advised to upgrade to 2025.7.1 to resolve.

Thank you to Elad Beber (Cymulate) for reporting these issues.

Record: GHSA-q66q-fx2p-7w4m
CVSS 4.0: 7.3 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:H/SI:H/SA:H
Weakness: CWE-59
Updated: 2026-11-02

NVD 7.3

Record: CVE-2025-53109
CVSS 4.0: 7.3 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness: CWE-59
Updated: 2026-11-02

OSV 7.3

Model Context Protocol Servers Vulnerable to Path Validation Bypass via Prefix Matching and Symlink Handling

Record: CVE-2025-53109
CVSS 4.0: 7.3 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:H/SI:H/SA:H
Weakness: CWE-59
Updated: 2026-11-02

OSVGHSA-q66q-fx2p-7w4m 7.3

@modelcontextprotocol/server-filesystem allows for path validation bypass via prefix matching and symlink handling

Versions of Filesystem prior to 0.6.3 & 2025.7.1 could allow access to unintended files via symlinks within allowed directories. Users are advised to upgrade to 2025.7.1 to resolve.

Thank you to Elad Beber (Cymulate) for reporting these issues.

Record: GHSA-q66q-fx2p-7w4m
CVSS 4.0: 7.3 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:H/SI:H/SA:H
Weakness: CWE-59
Updated: 2026-11-02

Affected products

modelcontextprotocol servers

Affected packages

Affected packages
Package	Affected	Fixed
`@modelcontextprotocol/server-filesystem` npm	through 0.6.2	None known
`@modelcontextprotocol/server-filesystem` npm	2025.1.14 up to 2025.7.1	2025.7.1

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-53109 is a high vulnerability (CVSS 7.3) in Modelcontextprotocol Servers, published July 1, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.77%, the 55th percentile. Fixed in @modelcontextprotocol/server-filesystem 2025.7.1.