{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "004123dd24c30dad6b649163575145f240dabc94"
            }
          ],
          "repo": "https://github.com/facebookexperimental/moxygen",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {},
  "details": "In moxygen before commit 004123dd24c3, MoQSession::dataStreamReadLoop keeps using a stream read handle after reading a FIN, which invalidates the handle under proxygen's WebTransport API. A remote peer can trigger the stale use by opening a data stream that names an unknown track alias and carries the FIN in the same write.",
  "id": "CVE-2026-84894",
  "modified": "2026-09-30T03:30:23.843412109Z",
  "published": "2026-09-28T19:16:50.213Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.facebook.com/security/advisories/cve-2026-84894"
    },
    {
      "type": "FIX",
      "url": "https://github.com/facebookexperimental/moxygen/commit/004123dd24c30dad6b649163575145f240dabc94"
    }
  ]
}