CVE-2026-91095

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{"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": [{"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": {"id": "CVE-2026-91095", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-30T19:49:10.823542Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-30T19:48:58.524Z"}}]}}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "proxygen", "vendor": "Facebook", "versions": [{"lessThan": "v2026.09.28.00", "status": "affected", "version": "v2024.10.28.00", "versionType": "semver"}]}], "source": "cve-assign@fb.com"}], "cveTags": [], "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."}], "id": "CVE-2026-91095", "lastModified": "2026-09-30T20:17:36.470", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-91095", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-30T19:49:10.823542Z", "version": "2.0.3"}}]}, "published": "2026-09-28T21:17:19.170", "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-2026-91095"}], "sourceIdentifier": "cve-assign@fb.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[v2024.10.28.00,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": "2026-09-28T22:45:08.187184+00:00", "updated": "2026-10-01T03:45:17.591630+00:00", "vendors": ["facebook", "facebook$PRODUCT$proxygen"]}