{"id":"CVE-2026-45781","revision":"8c21a1c607584ef2a5df07127c257561","records":[{"revision":"8c21a1c607584ef2a5df07127c257561","observedAt":"2026-10-27T13:11:36.603+00:00","statement":{"source":"nvd","id":"CVE-2026-45781","aliases":[],"title":"The MCP Registry provides MCP clients with a list of MCP servers, like an app store for MCP servers. Prior to 1.7.9, OCI ownership validation skips label-match check when upstream OCI registry returns HTTP 429, letting any authenticated pub…","description":"The MCP Registry provides MCP clients with a list of MCP servers, like an app store for MCP servers. Prior to 1.7.9, OCI ownership validation skips label-match check when upstream OCI registry returns HTTP 429, letting any authenticated publisher bind their io.github.<user>/* namespace to OCI images they do not control. internal/validators/registries/oci.go:104-119 fails open on http.StatusTooManyRequests: when the registry's anonymous fetch to the upstream OCI registry is rate-limited, ValidateOCI returns nil and the publish is accepted without ever running the io.modelcontextprotocol.server.name label-match check at lines 122-141. That label check is the only cross-system ownership proof the registry applies to OCI packages — every other registry type (NPM, PyPI, NuGet, MCPB) treats a non-200 upstream response as a hard error. This vulnerability is fixed in 1.7.9.","state":0,"publishedAt":"2026-05-14T21:16:48.48+00:00","modifiedAt":"2026-10-26T14:10:00.13+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N","score":3.5,"severity":"LOW"}],"references":["https://github.com/modelcontextprotocol/registry/security/advisories/GHSA-2v5f-5r6w-p67r"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-45781","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-636"],"productCriteria":[],"sourceDates":{"published":"2026-05-14T21:16:48.480","lastModified":"2026-10-26T14:10:00.130"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-45781","identifiers":["CVE-2026-45781"]},"retained":false,"historicalAffected":[]}],"coverage":[]}