{"cve":"CVE-2026-11720","nvd":{"published":"2026-06-29T18:16:36.173","modified":"2026-10-25T21:10:00.770","status":"Analyzed","description":"A path traversal vulnerability exists in the HTTP tool URL builder of googleapis/mcp-toolbox.\n\nWhen 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).","cvss_v4":{"vector":"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","score":9.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},"cwes":["CWE-22"],"references":["https://github.com/googleapis/mcp-toolbox/pull/3218"],"products":["google:mcp_toolbox_for_databases"],"source":"nvd","synced_at":"2026-10-25T23:44:33.281319194+00:00"},"epss":{"cve":"CVE-2026-11720","score":0.00533,"percentile":0.44729,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-vwxw-jrg6-9jxv","url":"https://osv.dev/vulnerability/GHSA-vwxw-jrg6-9jxv","summary":"MCP Toolbox HTTP tool path parameters allow traversal to unintended endpoints","modified":"2026-09-10T15:25:39.187280229Z","packages":[{"ecosystem":"Go","name":"github.com/googleapis/mcp-toolbox","purl":"pkg:golang/github.com/googleapis/mcp-toolbox","ranges":["<1.3.0"],"fixed":["1.3.0"]}]},{"id":"GO-2026-6411","url":"https://osv.dev/vulnerability/GO-2026-6411","summary":"MCP Toolbox HTTP tool path parameters allow traversal to unintended endpoints in github.com/googleapis/mcp-toolbox","modified":"2026-09-10T15:15:13.749645098Z","packages":[{"ecosystem":"Go","name":"github.com/googleapis/mcp-toolbox","purl":"pkg:golang/github.com/googleapis/mcp-toolbox","ranges":["<1.3.0"],"fixed":["1.3.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}