GCD AI RADAR
incidents/AIR-2025-0301

CVE-2025-53109: Model Context Protocol filesystem server symlink handling bypass

Attack on AI2 Disclosed vulnerabilityInfrastructure vulnerability

The Model Context Protocol filesystem server is vulnerable to path validation bypass through symlink handling within allowed directories. Users must update to the patched version to prevent unintended file exposure.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

Details

type
Attack on AI
An AI model, agent or AI-powered product was the thing exploited, abused or leaked.
categories
  • Infrastructure vulnerability
    CVEs and advisories in AI frameworks, inference servers, MCP servers, AI developer tools and hosting stacks.
owasp llm top 10
mitre atlas
no technique for these categories
Both rows are derived from the type and categories (OWASP 2025 edition, ATLAS release 2026.09), not classified per record. How
severity
2 · Disclosed vulnerability
CVE or vendor advisory, patched or patchable, no confirmed exploitation.
targets
Framework / tooling
products
@modelcontextprotocol/server-filesystem
incident date
1 Jul 2025
first reported
1 Jul 2025
origin
GitHub Advisory Database
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
classifier confidence
0.95 · published at or above 0.80; see the methodology
tags
CVE-2025-53109 · mcp · symlink
record
created 2026-10-18 07:00Z · updated 2026-10-18 10:04Z · json

Sources · 2

  1. 2025-07-01
    CVE-2025-53109: @modelcontextprotocol/server-filesystem allows for path validation bypass via prefix matching and symlink handling
    GitHub Advisory Database · github.com/advisories/GHSA-q66q-fx2p-7w4m
  2. 2025-07-02
    CVE-2025-53109: Model Context Protocol Servers is a collection of reference implementations for the model context protocol (MCP).
    NVD · nvd.nist.gov/vuln/detail/CVE-2025-53109

Titles and links belong to their publishers. The summary above is written by GCD AI RADAR in its own words; data is CC BY-SA 4.0.

Related incidents