{"id":"CVE-2026-103936","revision":null,"records":[{"revision":"d9bee8e5bc0e446f911210ce9f52e466","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-103936","aliases":[],"title":"libp2p: Single pre-auth STUN packet terminates `@libp2p/webrtc` WebRTC-direct Node.js listeners","description":"libp2p is a JavaScript implementation of the libp2p networking stack. Prior to 6.0.28, the @libp2p/webrtc webRTCDirect() Node.js listener processes unauthenticated STUN Binding Requests before PeerId authentication, Noise, muxing, protocol negotiation, connection creation, or connection-manager admission. The listener in packages/transport-webrtc/src/private-to-public/utils/stun-listener.ts forwards the packet-controlled request.ufrag into DirectRTCPeerConnection.setLocalDescription, where the value is reused as an ICE password without validating its required length and character set. A short credential causes node-datachannel or libdatachannel to raise an uncaught native invalid_argument and abort the process with SIGABRT, allowing a single remote UDP packet to deny service. The confirmed impact is process termination only, with no demonstrated memory corruption, code execution, browser impact, confidentiality impact, integrity impact, or connection-limit bypass. This issue is fixed in version 6.0.28.","state":0,"publishedAt":"2026-10-15T17:28:32.567+00:00","modifiedAt":"2026-10-16T17:12:49.532+00:00","affected":[{"ecosystem":"Vendor product","name":"js-libp2p","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"libp2p\",\n                    \"product\": \"js-libp2p\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 3.3.7\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"webrtc","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"@libp2p\",\n                    \"product\": \"webrtc\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 6.0.28\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","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/security/advisories/GHSA-x3m2-6mg8-vj7f","https://github.com/libp2p/js-libp2p/pull/3584","https://github.com/libp2p/js-libp2p/commit/68794c8e2e67d5f38da59e379dc051b2789e46f6","https://github.com/libp2p/js-libp2p/releases/tag/webrtc-v6.0.28"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-103936","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-103936","identifiers":["CVE-2026-103936"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EPSS backfill.","generation":"2026-11-09T10:04:34.0648037+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-09T10:04:34.0648037+00:00","lastSuccessAt":"2026-11-09T10:04:34.2253534+00:00","error":null,"lastVerifiedAt":"2026-11-09T10:04:34.2253535+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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