{"id":"GHSA-7pf3-8xx7-rvhf","revision":"a2c8b53cdcd74f9aaef8561eb4649215","records":[{"revision":"a2c8b53cdcd74f9aaef8561eb4649215","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-7pf3-8xx7-rvhf","aliases":["CVE-2026-9739","GO-2026-5870"],"title":"MCP Toolbox for Databases vulnerable to DNS rebinding attacks","description":"Vulnerable to DNS rebinding attacks when using SSE (http://b/499408790). During the beta phase, we implemented `allowed-origins` and `allowed-hosts` flags to align with MCP security guidelines. However, the hardcoded `Access-Control-Allow-Origin: *` header in the SSE initialization handler was inadvertently retained. This vulnerability specifically impacts users connecting via Toolbox using SSE under specification v2024-11-05.","state":0,"publishedAt":"2026-05-28T00:30:29+00:00","modifiedAt":"2026-07-07T16:11:35.4494768+00:00","affected":[{"ecosystem":"Go","name":"github.com/googleapis/mcp-toolbox","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.2.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"CRITICAL"}],"references":["https://nvd.nist.gov/vuln/detail/CVE-2026-9739","https://github.com/googleapis/mcp-toolbox/issues/3053","https://github.com/googleapis/mcp-toolbox/pull/3054","https://github.com/googleapis/mcp-toolbox/commit/c4c7bd917e686de68e2be866cfe3872c3439efae","https://github.com/googleapis/mcp-toolbox"],"sourceUrl":"https://github.com/advisories/GHSA-7pf3-8xx7-rvhf","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-7pf3-8xx7-rvhf","identifiers":["GHSA-7pf3-8xx7-rvhf","CVE-2026-9739","GO-2026-5870"]},"retained":false,"historicalAffected":[]}],"coverage":[]}