{
    "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": "2026-08-25T18:15:16.059Z"
    },
    "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"
            }
        }
    }
}