{"id":"CVE-2026-84894","state":"PUBLISHED","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 WebTranspo","description":"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.","publishedAt":"2026-09-28T18:40:55.707Z","updatedAt":"2026-09-30T15:05:50.817Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","source":"CISA-ADP"},"assigner":"Meta","products":["Meta Platforms, Inc moxygen"],"affected":[{"vendor":"Meta Platforms, Inc","product":"moxygen","defaultStatus":"unaffected","versions":[{"version":"b24f8e65cb83ebe5f3880cc4e3a4c8f64e1882f9","status":"affected","lessThan":"004123dd24c30dad6b649163575145f240dabc94","versionType":"git"}]}],"references":["https://www.facebook.com/security/advisories/cve-2026-84894","https://github.com/facebookexperimental/moxygen/commit/004123dd24c30dad6b649163575145f240dabc94"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/84xxx/CVE-2026-84894.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-84894","state":"PUBLISHED","datePublished":"2026-09-28T18:40:55.707Z","dateUpdated":"2026-09-30T15:05:50.817Z","assignerShortName":"Meta","assignerOrgId":"4fc57720-52fe-4431-a0fb-3d2c8747b827","dateReserved":"2026-09-02T14:52:36.354Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Meta Platforms, Inc","product":"moxygen","defaultStatus":"unaffected","versions":[{"version":"b24f8e65cb83ebe5f3880cc4e3a4c8f64e1882f9","status":"affected","lessThan":"004123dd24c30dad6b649163575145f240dabc94","versionType":"git"}]}],"references":[{"url":"https://www.facebook.com/security/advisories/cve-2026-84894","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/facebookexperimental/moxygen/commit/004123dd24c30dad6b649163575145f240dabc94","tags":["x_refsource_MISC"]}],"problemTypes":[{"descriptions":[{"description":"Use After Free (CWE-416)","lang":"en"}]}],"providerMetadata":{"shortName":"Meta","orgId":"4fc57720-52fe-4431-a0fb-3d2c8747b827","dateUpdated":"2026-09-28T18:40:55.707Z"},"dateAssigned":"2026-09-02T00:00:00.000Z"},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.5,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-09-30T15:05:21.880556Z","id":"CVE-2026-84894","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","type":"CWE","lang":"en","description":"CWE-416 Use After Free"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-30T15:05:50.817Z"}}]}}}