CVE-2026-55663
MediumCVSS 5.6Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
mediasoup versions npm 3.20.0-3.20.5 and Rust crate 0.22.0-0.22.4 have a vulnerability in the SCTP stack where state cookies are authenticated using only hardcoded values, allowing an attacker to forge a COOKIE-ECHO and establish an unauthorized SCTP association.
Risk Assessment
An on-path attacker can inject DataChannel messages as a trusted peer, potentially leading to communication integrity compromise.
Recommendation
Update the npm package to version 3.20.6 or the Rust crate to version 0.22.5, which include the fix.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

