CVE-2026-11720 - Path Traversal in googleapis/mcp-toolbox HTTP Tool URL Builder

CVE-2026-11720 - Path Traversal in googleapis/mcp-toolbox HTTP Tool URL Builder

https://cvefeed.io/rssfeed/latest.atom / Mon, 06/29/2026 - 22:02
CVE ID :CVE-2026-11720
Published : June 29, 2026, 5:51 p.m. | 51 minutes ago
Description :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
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