{"id":"CVE-2026-91095","title":"In proxygen from v2024.10.28.00 until v2026.09.28.00, the HTTPTransaction::onWebTransportUniStream and HTTPTransaction::onWebTransportBidiStream APIs could return stream handles that the stream handler had already freed","summary":"In proxygen from v2024.10.28.00 until v2026.09.28.00, the HTTPTransaction::onWebTransportUniStream and HTTPTransaction::onWebTransportBidiStream APIs could return stream handles that the stream handler had already freed. HQSession then i…","severity":"none","cwe":["CWE-416"],"vendor":"Facebook","product":"proxygen","affected":["proxygen >= v2024.10.28.00 < v2026.09.28.00"],"published":"2026-09-28","updated":"2026-09-28","sourceUpdated":"2026-09-28T21:17:19.273","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-91095","references":[{"url":"https://github.com/facebook/proxygen/commit/479eb5574195764e80e6cedebef669f6baa85083","label":"cve-assign@fb.com"},{"url":"https://www.facebook.com/security/advisories/cve-2026-91095","label":"cve-assign@fb.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-28T21:20:54.787Z","slug":"CVE-2026-91095","body":"## Overview\n\nIn proxygen from v2024.10.28.00 until v2026.09.28.00, the HTTPTransaction::onWebTransportUniStream and HTTPTransaction::onWebTransportBidiStream APIs could return stream handles that the stream handler had already freed. HQSession then installed those handles as transport read callbacks, which could lead to use of freed memory.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}