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Wednesday, 28 October 2026
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Incident database

Path traversal in Zen MCP Server allows arbitrary file reads (CVE-2025-66689)

CVE-2025-66689 describes a path traversal flaw in Zen MCP Server before version 9.8.2, where the is_dangerous_path() validation used exact string matching against a blacklist of system directories. Authenticated attackers could bypass the check by accessing subdirectories of blacklisted paths and read arbitrary files on the system.

Disclosed 12 January 2026 · Record updated 1 October 2026

Impact

Authenticated attackers could read arbitrary files on the host system running the MCP server; fixed in version 9.8.2.

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2025-66689