CVE-2026-55663
CVE-2026-55663 · mediasoup: SCTP state cookie lacks cryptographic authentication, enabling unauthorized association establishment (RFC 9260 violation)
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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.
CVSS 5.6 · Mittel · EPSS 0,2% · Korrektur verfügbar
- Veröffentlicht
- Aktualisiert
Technologie-Stack: node
Betroffene Produkte und Versionen
mediasoup
- Softwareversionen
- >= 3.20.0, < 3.20.6: Betroffen
- >= 0.22.0, < 0.22.5: Betroffen
Keine Korrektur veröffentlicht
mediasoup npm
- Betroffene Versionsbereiche
- SEMVER: ≥ 3.20.0, < 3.20.6
Auf 3.20.6 aktualisieren
mediasoup crates.io
- Betroffene Versionsbereiche
- SEMVER: ≥ 0.22.0, < 0.22.5
Auf 0.22.5 aktualisieren
Originalquellen
- https://github.com/versatica/mediasoup/security/advisories/GHSA-p7x2-g5cq-fhmq
- https://github.com/versatica/mediasoup/pull/1829
- https://github.com/versatica/mediasoup/commit/9c1a90a8f9206b965e727d134846fb42df4980a7
- https://github.com/versatica/mediasoup/releases/tag/3.20.6
- https://nvd.nist.gov/vuln/detail/CVE-2026-55663