{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-55663",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-25T18:55:43.763697Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-25T18:55:59.044Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/versatica/mediasoup/security/advisories/GHSA-p7x2-g5cq-fhmq"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "mediasoup",
          "vendor": "versatica",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 3.20.0, \u003c 3.20.6"
            },
            {
              "status": "affected",
              "version": "\u003e= 0.22.0, \u003c 0.22.5"
            }
          ]
        }
      ],
      "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\u0027s 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."
        }
      ],
      "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-345",
              "description": "CWE-345: Insufficient Verification of Data Authenticity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T18:15:16.059Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "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"
        }
      ],
      "source": {
        "advisory": "GHSA-p7x2-g5cq-fhmq",
        "discovery": "UNKNOWN"
      },
      "title": "mediasoup: SCTP state cookie lacks cryptographic authentication, enabling unauthorized association establishment (RFC 9260 violation)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-55663",
    "datePublished": "2026-08-25T18:15:16.059Z",
    "dateReserved": "2026-06-17T00:05:03.777Z",
    "dateUpdated": "2026-08-25T18:55:59.044Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}