{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-11720: Path Traversal in googleapis/mcp-toolbox HTTP Tool URL Builder","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-11720","status":"final","version":"1","initial_release_date":"2026-06-29T17:51:30.077Z","current_release_date":"2026-06-29T18:26:17.242Z","revision_history":[{"date":"2026-06-29T17:51:30.077Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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).","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-11720 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-11720"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-11720"},{"category":"external","summary":"github.com","url":"https://github.com/googleapis/mcp-toolbox/pull/3218"}]},"product_tree":{"branches":[{"category":"vendor","name":"Google","branches":[{"category":"product_name","name":"MCP Toolbox for Databases (googleapis/mcp-toolbox)","branches":[{"category":"product_version_range","name":"<1.3.0","product":{"name":"Google MCP Toolbox for Databases (googleapis/mcp-toolbox) <1.3.0","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:google:mcp_toolbox_for_databases_\\(googleapis\\/mcp-toolbox\\):*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-11720","title":"Path Traversal in googleapis/mcp-toolbox HTTP Tool URL Builder","notes":[{"category":"description","text":"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).","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"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","baseScore":9.3,"baseSeverity":"CRITICAL"},"products":["CSAFPID-1"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 1.3.0.","product_ids":["CSAFPID-1"]}]}]}