{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-91095","assignerOrgId":"4fc57720-52fe-4431-a0fb-3d2c8747b827","state":"PUBLISHED","assignerShortName":"Meta","dateReserved":"2026-09-14T18:40:39.036Z","datePublished":"2026-09-28T20:44:45.928Z","dateUpdated":"2026-09-30T19:49:15.429Z"},"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"proxygen","vendor":"Facebook","versions":[{"lessThan":"v2026.09.28.00","status":"affected","version":"v2024.10.28.00","versionType":"semver"}]}],"dateAssigned":"2026-09-14T00:00:00.000Z","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."}],"problemTypes":[{"descriptions":[{"description":"Use After Free (CWE-416)","lang":"en"}]}],"providerMetadata":{"orgId":"4fc57720-52fe-4431-a0fb-3d2c8747b827","shortName":"Meta","dateUpdated":"2026-09-28T20:44:45.928Z"},"references":[{"tags":["x_refsource_CONFIRM"],"url":"https://www.facebook.com/security/advisories/cve-2026-91095"},{"tags":["x_refsource_MISC"],"url":"https://github.com/facebook/proxygen/commit/479eb5574195764e80e6cedebef669f6baa85083"}]},"adp":[{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-416","lang":"en","description":"CWE-416 Use After Free"}]}],"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"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-30T19:49:15.429Z"}}]}}