Hub/AI Security/Advisories/GHSA-53mr-w429-c597
Parent-Directory Fallback TOCTOU in @modelcontextprotocol/server-filesystem Permits Arbitrary File Write Outside allowedDirectories
MCP reference servers security advisory.
| GHSA | GHSA-53mr-w429-c597 |
|---|---|
| Published | Oct 25, 2026 |
| Severity | Low 2.2 |
| CVE | None assigned |
| Status | patched |
| Affected | >= 2025.1.14, <= 2026.8.31, < 2.0.1 |
| Fixed in | 2.0.1 |
| Component | MCP reference servers |
Sources
Checked 2026-11-04. We copy severity and fix versions from the source and never estimate them.
Affected tools
Weekly, free
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