{"schema":"threatline.record/2","record":{"id":"CVE-2026-84894","aliases":[],"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 pee","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.","categories":["Unclassified"],"product":"moxygen","vendor":"Meta Platforms, Inc","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-84894","source_modified_at":"2026-09-30T15:05:50.817Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"moxygen","vendor":"Meta Platforms, Inc","versions":[{"lessThan":"004123dd24c30dad6b649163575145f240dabc94","status":"affected","version":"b24f8e65cb83ebe5f3880cc4e3a4c8f64e1882f9","versionType":"git"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-84894","source_modified_at":"2026-09-30T15:05:50.817Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"moxygen","ecosystem":null},"version":"004123dd24c30dad6b649163575145f240dabc94","basis":"first unaffected version stated in the CVE record"}],"cvss":7.5,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00255,"percentile":0.16113,"score_date":"2026-10-23"},"published_at":"2026-09-28T18:40:55.707Z","modified_at":"2026-09-30T15:05:50.817Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-84894","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-30T15:05:50.817Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-84894","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://www.facebook.com/security/advisories/cve-2026-84894","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/facebookexperimental/moxygen/commit/004123dd24c30dad6b649163575145f240dabc94","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"partial","assessed_at":"2026-09-30T15:05:21.880556Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-09-30T15:05:50.817Z","content_hash":"06778d813b7bd6a3874bbc582cbaae750efb7bd30091587f40d2a18290ff337d"}}