{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-84895","assignerOrgId":"4fc57720-52fe-4431-a0fb-3d2c8747b827","state":"PUBLISHED","assignerShortName":"Meta","dateReserved":"2026-09-02T14:52:36.354Z","datePublished":"2026-09-28T20:44:34.886Z","dateUpdated":"2026-10-01T14:02:23.724Z"},"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"proxygen","vendor":"Facebook","versions":[{"lessThan":"v2026.09.28.00","status":"affected","version":"v2026.04.06.00","versionType":"semver"}]}],"dateAssigned":"2026-09-02T00:00:00.000Z","descriptions":[{"lang":"en","value":"In proxygen from v2026.04.06.00 until v2026.09.28.00, QuicWtSession::closeSession accesses its member fields after calling the base QuicWtSessionBase::closeSession method. The base method notifies the session handler, which may release the last reference to the session and destroy it."}],"problemTypes":[{"descriptions":[{"description":"Use After Free (CWE-416)","lang":"en"}]}],"providerMetadata":{"orgId":"4fc57720-52fe-4431-a0fb-3d2c8747b827","shortName":"Meta","dateUpdated":"2026-09-28T20:44:34.886Z"},"references":[{"tags":["x_refsource_CONFIRM"],"url":"https://www.facebook.com/security/advisories/cve-2026-84895"},{"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":7.3,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","integrityImpact":"LOW","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"LOW","privilegesRequired":"NONE","confidentialityImpact":"LOW"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-10-01T14:01:47.375791Z","id":"CVE-2026-84895","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":"2026-10-01T14:02:23.724Z"}}]}}