{"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": "2026-09-28T20:44:34.886Z"}, "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"}]}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "proxygen", "vendor": "Facebook", "versions": [{"lessThan": "v2026.09.28.00", "status": "affected", "version": "v2026.04.06.00", "versionType": "semver"}]}], "source": "cve-assign@fb.com"}], "cveTags": [], "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."}], "id": "CVE-2026-84895", "lastModified": "2026-09-28T21:17:19.130", "metrics": {}, "published": "2026-09-28T21:17:19.027", "references": [{"source": "cve-assign@fb.com", "url": "https://github.com/facebook/proxygen/commit/479eb5574195764e80e6cedebef669f6baa85083"}, {"source": "cve-assign@fb.com", "url": "https://www.facebook.com/security/advisories/cve-2026-84895"}], "sourceIdentifier": "cve-assign@fb.com", "vulnStatus": "Deferred"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[v2026.04.06.00,v2026.09.28.00)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "proxygen", "source": "cna", "vendor": "Facebook"}, "product": "proxygen", "vendor": "facebook"}], "created": "2026-09-28T22:30:08.184413+00:00", "title": "Use\u2011After\u2011Free in Facebook Proxygen\u2019s QUIC Session Handling Leading to Potential Code Execution", "updated": "2026-09-28T23:00:07.185167+00:00", "vendors": ["facebook", "facebook$PRODUCT$proxygen"], "weaknesses": ["CWE-416"]}