{"schemaVersion":3,"id":"CVE-2026-84895","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"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. 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At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory \"belongs\" to the code that operates on the new pointer.","type":"weakness","status":"Stable","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/416.html"}],"affected":[{"vendor":"facebook","product":"proxygen","name":"proxygen","label":"proxygen","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ v2026.04.06.00, < v2026.09.28.00","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ v2026.04.06.00, < v2026.09.28.00","eol":null,"hubHref":"/vendor/facebook/proxygen"}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.facebook.com/security/advisories/cve-2026-84895","label":"www.facebook.com/security/advisories/cve-2026-84895","hostname":"www.facebook.com","tags":["X Refsource CONFIRM"]},{"url":"https://github.com/facebook/proxygen/commit/479eb5574195764e80e6cedebef669f6baa85083","label":"github.com/facebook/proxygen/commit/479eb5574195764e80e6cedebef669f6baa85083","hostname":"github.com","tags":["X Refsource MISC"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-09-28T20:44:34.886Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-01T14:02:23.724Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":29,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T18:47:45.555Z","stale":false,"partial":false}}