{"id":"CVE-2026-49866","revision":"26e053291bb1448685bdb6e234d80fdd","records":[{"revision":"26e053291bb1448685bdb6e234d80fdd","observedAt":"2026-10-25T12:17:38.331+00:00","statement":{"source":"nvd","id":"CVE-2026-49866","aliases":[],"title":"libp2p is a JavaScript Implementation of libp2p networking stack. Prior to 16.0.0, @libp2p/gossipsub defaultDecodeRpcLimits set maxIhaveMessageIDs and maxIwantMessageIDs to Infinity, allowing oversized IHAVE and IWANT control message arrays…","description":"libp2p is a JavaScript Implementation of libp2p networking stack. Prior to 16.0.0, @libp2p/gossipsub defaultDecodeRpcLimits set maxIhaveMessageIDs and maxIwantMessageIDs to Infinity, allowing oversized IHAVE and IWANT control message arrays in message/decodeRpc.ts and gossipsub.ts to synchronously iterate roughly 180,000 message IDs per 4 MB frame and block the Node.js event loop. This issue is fixed in version 16.0.0.","state":0,"publishedAt":"2026-07-08T21:16:49.137+00:00","modifiedAt":"2026-07-10T19:10:59.333+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/libp2p/js-libp2p/commit/773dd80ded24dbd6b19e675c89fd2f3b45f2d899","https://github.com/libp2p/js-libp2p/pull/3520","https://github.com/libp2p/js-libp2p/releases/tag/gossipsub-v16.0.0","https://github.com/libp2p/js-libp2p/security/advisories/GHSA-cwc9-cp4j-mcvv"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-49866","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-770"],"productCriteria":[],"sourceDates":{"published":"2026-07-08T21:16:49.137","lastModified":"2026-07-10T19:10:59.333"},"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-2026-49866","identifiers":["CVE-2026-49866"]},"retained":false,"historicalAffected":[]}],"coverage":[]}