{"id":"CVE-2026-91096","title":"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…","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 streams that were no longer open before…","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":"Facebook","product":"proxygen","affected":["proxygen >= v2024.10.28.00 < v2026.09.28.00"],"published":"2026-09-28","updated":"2026-09-30","sourceUpdated":"2026-09-30T20:17:36.637","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-91096","references":[{"url":"https://github.com/facebook/proxygen/commit/479eb5574195764e80e6cedebef669f6baa85083","label":"cve-assign@fb.com"},{"url":"https://www.facebook.com/security/advisories/cve-2026-91096","label":"cve-assign@fb.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91096.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-91096"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-91096"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-30T19:47:52.478208Z"},"epss":0.00255,"epssPercentile":0.16945,"ingestedAt":"2026-09-28T21:20:54.787Z","slug":"CVE-2026-91096","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · updated 2026-09-29 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91096.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":212297,"id":"CVE-2026-91096","ts":1790668139835,"field":"cvss","old":null,"new":"7.5"},{"seq":212296,"id":"CVE-2026-91096","ts":1790668139835,"field":"severity","old":"none","new":"high"}]}