{"id":"CVE-2026-84894","title":"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","summary":"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 openin…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-416"],"vendor":"Meta Platforms, Inc","product":"moxygen","affected":["moxygen >= b24f8e65cb83ebe5f3880cc4e3a4c8f64e1882f9 < 004123dd24c30dad6b649163575145f240dabc94"],"published":"2026-09-28","updated":"2026-09-30","sourceUpdated":"2026-09-30T19:57:08.043","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-84894","references":[{"url":"https://github.com/facebookexperimental/moxygen/commit/004123dd24c30dad6b649163575145f240dabc94","label":"cve-assign@fb.com"},{"url":"https://www.facebook.com/security/advisories/cve-2026-84894","label":"cve-assign@fb.com"}],"tags":["nvd","cve.org"],"epss":0.00255,"epssPercentile":0.16945,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-30T15:05:21.880556Z"},"ingestedAt":"2026-09-28T19:19:07.734Z","slug":"CVE-2026-84894","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":213749,"id":"CVE-2026-84894","ts":1790784791986,"field":"cvss","old":null,"new":"7.5"},{"seq":213748,"id":"CVE-2026-84894","ts":1790784791986,"field":"severity","old":"none","new":"high"}]}