{"schema":"threatline.record/2","record":{"id":"CVE-2026-91096","aliases":[],"summary":"In proxygen from v2024.10.28.00 until v2026.09.28.00, WebTransportImpl::terminateSessionStreams (WebTransportImpl::destroy in releases before v2025.08.18.00) failed to unregister read callbacks for st","details":"In proxygen from v2024.10.28.00 until v2026.09.28.00, WebTransportImpl::terminateSessionStreams (WebTransportImpl::destroy in releases before v2025.08.18.00) failed to unregister read callbacks for streams that were no longer open before destroying them. The transport could then invoke a read callback that had been freed.","categories":["Unclassified"],"product":"proxygen","vendor":"Facebook","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-91096","source_modified_at":"2026-09-30T19:47:55.479Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"proxygen","vendor":"Facebook","versions":[{"lessThan":"v2026.09.28.00","status":"affected","version":"v2024.10.28.00","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[],"cvss":7.5,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00255,"percentile":0.16113,"score_date":"2026-10-23"},"published_at":"2026-09-28T20:44:57.363Z","modified_at":"2026-09-30T19:47:55.479Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-91096","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-30T19:47:55.479Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-91096","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-2026-91096","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/facebook/proxygen/commit/479eb5574195764e80e6cedebef669f6baa85083","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":"2026-09-30T19:47:52.478208Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-09-30T19:47:55.479Z","content_hash":"9f574bbe9474077251247486e2cbc2d0295a7e6ffdc43c0ac289cc9a5f33b007"}}