{"schemaVersion":3,"id":"CVE-2026-11720","aliases":["GHSA-vwxw-jrg6-9jxv","GO-2026-6411"],"status":"published","duplicateOf":null,"title":null,"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).","dates":{"published":"2026-06-29T17:51:30.077Z","modified":"2026-06-29T18:26:17.242Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.3,"severity":"critical","version":"4.0","versionLabel":"v4.0","source":"CVE.org","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","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":9.3,"severity":"critical","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","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · 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Limitation of a Pathname to a Restricted Directory ('Path Traversal')","description":"The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/22.html"}],"affected":[{"vendor":"github.com/googleapis","product":"mcp-toolbox","name":"github.com/googleapis/mcp-toolbox","label":"mcp-toolbox","ecosystem":"Go","cpePart":null,"purl":"pkg:golang/github.com/googleapis/mcp-toolbox","purlType":"golang","versions":[{"text":"< 1.3.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 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1.3.0","eol":null,"hubHref":"/vendor/google/mcp_toolbox_for_databases_googleapismcp-toolbox"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/googleapis/mcp-toolbox/pull/3218","label":"github.com/googleapis/mcp-toolbox/pull/3218","hostname":"github.com","tags":["WEB","FIX","Issue Tracking","Patch"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-11720","label":"nvd.nist.gov/vuln/detail/CVE-2026-11720","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://github.com/googleapis/mcp-toolbox/commit/80a66021205e032a424fff87b3dc6d92da58aa77","label":"github.com/googleapis/mcp-toolbox/commit/80a66021205e032a424fff87b3dc6d92da58aa77","hostname":"github.com","tags":["WEB","FIX"]},{"url":"https://github.com/googleapis/mcp-toolbox","label":"github.com/googleapis/mcp-toolbox","hostname":"github.com","tags":["PACKAGE"]},{"url":"https://github.com/googleapis/mcp-toolbox/releases/tag/v1.3.0","label":"github.com/googleapis/mcp-toolbox/releases/tag/v1.3.0","hostname":"github.com","tags":["WEB"]},{"url":"https://github.com/advisories/GHSA-vwxw-jrg6-9jxv","label":"github.com/advisories/GHSA-vwxw-jrg6-9jxv","hostname":"github.com","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:21897-1","SUSE-SU-2026:23855-1","SUSE-SU-2026:23863-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:21897-1","SUSE-SU-2026:23855-1","SUSE-SU-2026:23863-1"]},"timeline":[{"kind":"published","date":"2026-06-29T17:51:30.077Z","label":"Published","detail":"Vulnerability 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