{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55663","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-17T00:05:03.777Z","datePublished":"2026-08-25T18:15:16.059Z","dateUpdated":"2026-08-25T18:55:59.044Z"},"containers":{"cna":{"title":"mediasoup: SCTP state cookie lacks cryptographic authentication, enabling unauthorized association establishment (RFC 9260 violation)","problemTypes":[{"descriptions":[{"cweId":"CWE-345","lang":"en","description":"CWE-345: Insufficient Verification of Data Authenticity","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.6,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","version":"3.1"}}],"references":[{"name":"https://github.com/versatica/mediasoup/security/advisories/GHSA-p7x2-g5cq-fhmq","tags":["x_refsource_CONFIRM"],"url":"https://github.com/versatica/mediasoup/security/advisories/GHSA-p7x2-g5cq-fhmq"},{"name":"https://github.com/versatica/mediasoup/pull/1829","tags":["x_refsource_MISC"],"url":"https://github.com/versatica/mediasoup/pull/1829"},{"name":"https://github.com/versatica/mediasoup/commit/9c1a90a8f9206b965e727d134846fb42df4980a7","tags":["x_refsource_MISC"],"url":"https://github.com/versatica/mediasoup/commit/9c1a90a8f9206b965e727d134846fb42df4980a7"},{"name":"https://github.com/versatica/mediasoup/releases/tag/3.20.6","tags":["x_refsource_MISC"],"url":"https://github.com/versatica/mediasoup/releases/tag/3.20.6"}],"affected":[{"vendor":"versatica","product":"mediasoup","versions":[{"version":">= 3.20.0, < 3.20.6","status":"affected"},{"version":">= 0.22.0, < 0.22.5","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-08-25T18:15:16.059Z"},"descriptions":[{"lang":"en","value":"mediasoup is a WebRTC video conferencing system. From version 3.20.0 until 3.20.6 for the npm package and from 0.22.0 until 0.22.5 for the Rust crate, mediasoup's built-in SCTP stack authenticates state cookies using only the hardcoded msworker and 0xAD81 magic values instead of a per-instance secret and HMAC, contrary to RFC 9260 Section 5.1.3. The cookie structure and validation in worker/include/RTC/SCTP/association/StateCookie.hpp and worker/src/RTC/SCTP/association/StateCookie.cpp allow an on-path attacker targeting PlainTransport or PipeTransport with SCTP enabled and without DTLS protection to forge a COOKIE-ECHO whose packet verification tag matches the attacker-controlled localVerificationTag. The forged cookie passes StateCookie::IsMediasoupStateCookie() and Association::HandleReceivedCookieEchoChunk(), establishes an unauthorized SCTP association, and permits DataChannel message injection as a trusted peer. WebRtcTransport is not affected because its SCTP runs inside DTLS. This issue is fixed in npm version 3.20.6 and Rust crate version 0.22.5."}],"source":{"advisory":"GHSA-p7x2-g5cq-fhmq","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/versatica/mediasoup/security/advisories/GHSA-p7x2-g5cq-fhmq","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-25T18:55:43.763697Z","id":"CVE-2026-55663","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-25T18:55:59.044Z"}}]}}