CVE-2026-11720 (GCVE-0-2026-11720)

Vulnerability from cvelistv5 – Published: 2026-06-29 17:51 – Updated: 2026-06-29 18:26
VLAI?
Title
Path Traversal in googleapis/mcp-toolbox HTTP Tool URL Builder
Summary
A path traversal vulnerability exists in the HTTP tool URL builder of googleapis/mcp-toolbox. When constructing downstream API requests, the URL builder substitutes user-controlled pathParams into the configured tool path and parses the resulting string as a relative URL. While it checks that the input does not alter the scheme, host, or user info, it relies on ResolveReference for the final URL resolution. Because dot segments (../) are normalized during this resolution step, an attacker can supply path parameters containing directory traversal sequences to escape the operator-configured path scope. This allows the client to coerce the toolbox into making requests to unintended endpoints on the same target host while forwarding the toolbox's configured credentials (e.g., bypassing a restricted path like /api/v1/users/{{.id}} to reach /admin/secrets).
Severity ?
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
Impacted products
Vendor Product Version
Google MCP Toolbox for Databases (googleapis/mcp-toolbox) Affected: 0 , < 1.3.0 (semver)
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Credits
Ryan Vonbrubeck / @dodge1218
Show details on NVD website
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