{"id":"CVE-2026-91095","state":"PUBLISHED","title":"In proxygen from v2024.10.28.00 until v2026.09.28.00, the HTTPTransaction::onWebTransportUniStream and HTTPTransaction::onWebTransportBidiStream APIs could return stream handles th","description":"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 installed those handles as transport read callbacks, which could lead to use of freed memory.","publishedAt":"2026-09-28T20:44:45.928Z","updatedAt":"2026-09-30T19:49:15.429Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","source":"CISA-ADP"},"assigner":"Meta","products":["Facebook proxygen"],"affected":[{"vendor":"Facebook","product":"proxygen","defaultStatus":"unaffected","versions":[{"version":"v2024.10.28.00","status":"affected","lessThan":"v2026.09.28.00","versionType":"semver"}]}],"references":["https://www.facebook.com/security/advisories/cve-2026-91095","https://github.com/facebook/proxygen/commit/479eb5574195764e80e6cedebef669f6baa85083"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/91xxx/CVE-2026-91095.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-91095","state":"PUBLISHED","datePublished":"2026-09-28T20:44:45.928Z","dateUpdated":"2026-09-30T19:49:15.429Z","assignerShortName":"Meta","assignerOrgId":"4fc57720-52fe-4431-a0fb-3d2c8747b827","dateReserved":"2026-09-14T18:40:39.036Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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 installed those handles as transport read callbacks, which could lead to use of freed memory."}],"affected":[{"vendor":"Facebook","product":"proxygen","defaultStatus":"unaffected","versions":[{"version":"v2024.10.28.00","status":"affected","lessThan":"v2026.09.28.00","versionType":"semver"}]}],"references":[{"url":"https://www.facebook.com/security/advisories/cve-2026-91095","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/facebook/proxygen/commit/479eb5574195764e80e6cedebef669f6baa85083","tags":["x_refsource_MISC"]}],"problemTypes":[{"descriptions":[{"description":"Use After Free (CWE-416)","lang":"en"}]}],"providerMetadata":{"shortName":"Meta","orgId":"4fc57720-52fe-4431-a0fb-3d2c8747b827","dateUpdated":"2026-09-28T20:44:45.928Z"},"dateAssigned":"2026-09-14T00:00:00.000Z"},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.3,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"LOW","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-09-30T19:49:10.823542Z","id":"CVE-2026-91095","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":"2026-09-30T19:49:15.429Z"}}]}}}