{"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"}], "x_gcve": [{"vulnId": "CVE-2026-84895", "recordType": "advisory"}]}, "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"}}]}, "vulnerability-lookup:meta": {"epss": {"cve": "CVE-2026-84895", "date": "2026-11-13", "epss": "0.00195", "percentile": "0.09285"}, "nvd": "{\"cve\":{\"id\":\"CVE-2026-84895\",\"sourceIdentifier\":\"cve-assign@fb.com\",\"published\":\"2026-09-28T21:17:19.027\",\"lastModified\":\"2026-10-01T15:17:32.457\",\"vulnStatus\":\"Deferred\",\"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.\"}],\"affected\":[{\"source\":\"cve-assign@fb.com\",\"affectedData\":[{\"vendor\":\"Facebook\",\"product\":\"proxygen\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"v2026.04.06.00\",\"lessThan\":\"v2026.09.28.00\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L\",\"baseScore\":7.3,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":3.9,\"impactScore\":3.4}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-10-01T14:01:47.375791Z\",\"id\":\"CVE-2026-84895\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"yes\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"references\":[{\"url\":\"https://github.com/facebook/proxygen/commit/479eb5574195764e80e6cedebef669f6baa85083\",\"source\":\"cve-assign@fb.com\"},{\"url\":\"https://www.facebook.com/security/advisories/cve-2026-84895\",\"source\":\"cve-assign@fb.com\"}]}}", "redhat_vex": {"current_release_date": "2026-10-31T08:06:52+00:00", "cve": "CVE-2026-84895", "id": "CVE-2026-84895", "initial_release_date": "2026-09-28T20:44:34.886000+00:00", "product_status:known_not_affected": "1", "source": "Red Hat CSAF VEX", "status": "final", "title": "proxygen: proxygen: Denial of Service via use-after-free during session closure", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84895.json", "version": "3"}, "vulnrichment": {"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"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\": {\"id\": \"CVE-2026-84895\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-01T14:01:47.375791Z\"}}}], \"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\": \"2026-10-01T14:01:28.375Z\"}}], \"cna\": {\"affected\": [{\"vendor\": \"Facebook\", \"product\": \"proxygen\", \"versions\": [{\"status\": \"affected\", \"version\": \"v2026.04.06.00\", \"lessThan\": \"v2026.09.28.00\", \"versionType\": \"semver\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://www.facebook.com/security/advisories/cve-2026-84895\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/facebook/proxygen/commit/479eb5574195764e80e6cedebef669f6baa85083\", \"tags\": [\"x_refsource_MISC\"]}], \"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\": [{\"lang\": \"en\", \"description\": \"Use After Free (CWE-416)\"}]}], \"providerMetadata\": {\"orgId\": \"4fc57720-52fe-4431-a0fb-3d2c8747b827\", \"shortName\": \"Meta\", \"dateUpdated\": \"2026-09-28T20:44:34.886Z\"}}}", "cveMetadata": "{\"cveId\": \"CVE-2026-84895\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-01T14:02:23.724Z\", \"dateReserved\": \"2026-09-02T14:52:36.354Z\", \"assignerOrgId\": \"4fc57720-52fe-4431-a0fb-3d2c8747b827\", \"datePublished\": \"2026-09-28T20:44:34.886Z\", \"assignerShortName\": \"Meta\"}", "dataType": "CVE_RECORD", "dataVersion": "5.2"}}}
