{"api_version":"1","generated_at":"2026-10-04T05:52:43+00:00","cve":"CVE-2026-84894","urls":{"html":"https://cve.report/CVE-2026-84894","api":"https://cve.report/api/cve/CVE-2026-84894.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-84894","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-84894"},"summary":{"title":"CVE-2026-84894","description":"In moxygen before commit 004123dd24c3, MoQSession::dataStreamReadLoop keeps using a stream read handle after reading a FIN, which invalidates the handle under proxygen's WebTransport API. A remote peer can trigger the stale use by opening a data stream that names an unknown track alias and carries the FIN in the same write.","state":"PUBLISHED","assigner":"Meta","published_at":"2026-09-28 19:16:50","updated_at":"2026-09-30 19:57:08"},"problem_types":["CWE-416","Use After Free (CWE-416)","CWE-416 CWE-416 Use After Free"],"metrics":[{"version":"3.1","source":"ADP","type":"DECLARED","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}},{"version":"3.1","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"}}],"references":[{"url":"https://www.facebook.com/security/advisories/cve-2026-84894","name":"https://www.facebook.com/security/advisories/cve-2026-84894","refsource":"cve-assign@fb.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/facebookexperimental/moxygen/commit/004123dd24c30dad6b649163575145f240dabc94","name":"https://github.com/facebookexperimental/moxygen/commit/004123dd24c30dad6b649163575145f240dabc94","refsource":"cve-assign@fb.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-84894","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-84894","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Meta Platforms, Inc","product":"moxygen","version":"affected b24f8e65cb83ebe5f3880cc4e3a4c8f64e1882f9 004123dd24c30dad6b649163575145f240dabc94 git","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"84894","cve":"CVE-2026-84894","epss":"0.002550000","percentile":"0.154180000","score_date":"2026-10-01","updated_at":"2026-10-02 00:12:55"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}},{"other":{"content":{"id":"CVE-2026-84894","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-09-30T15:05:21.880556Z","version":"2.0.3"},"type":"ssvc"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","description":"CWE-416 Use After Free","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-09-30T15:05:50.817Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"defaultStatus":"unaffected","product":"moxygen","vendor":"Meta Platforms, Inc","versions":[{"lessThan":"004123dd24c30dad6b649163575145f240dabc94","status":"affected","version":"b24f8e65cb83ebe5f3880cc4e3a4c8f64e1882f9","versionType":"git"}]}],"dateAssigned":"2026-09-02T00:00:00.000Z","descriptions":[{"lang":"en","value":"In moxygen before commit 004123dd24c3, MoQSession::dataStreamReadLoop keeps using a stream read handle after reading a FIN, which invalidates the handle under proxygen's WebTransport API. A remote peer can trigger the stale use by opening a data stream that names an unknown track alias and carries the FIN in the same write."}],"problemTypes":[{"descriptions":[{"description":"Use After Free (CWE-416)","lang":"en"}]}],"providerMetadata":{"dateUpdated":"2026-09-28T18:40:55.707Z","orgId":"4fc57720-52fe-4431-a0fb-3d2c8747b827","shortName":"Meta"},"references":[{"tags":["x_refsource_CONFIRM"],"url":"https://www.facebook.com/security/advisories/cve-2026-84894"},{"tags":["x_refsource_MISC"],"url":"https://github.com/facebookexperimental/moxygen/commit/004123dd24c30dad6b649163575145f240dabc94"}]}},"cveMetadata":{"assignerOrgId":"4fc57720-52fe-4431-a0fb-3d2c8747b827","assignerShortName":"Meta","cveId":"CVE-2026-84894","datePublished":"2026-09-28T18:40:55.707Z","dateReserved":"2026-09-02T14:52:36.354Z","dateUpdated":"2026-09-30T15:05:50.817Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-28 19:16:50","lastModifiedDate":"2026-09-30 19:57:08","problem_types":["CWE-416","Use After Free (CWE-416)","CWE-416 CWE-416 Use After Free"],"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:H/I:N/A:N","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-30T15:05:21.880556Z","id":"CVE-2026-84894","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"84894","Ordinal":"1","Title":"CVE-2026-84894","CVE":"CVE-2026-84894","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"84894","Ordinal":"1","NoteData":"In moxygen before commit 004123dd24c3, MoQSession::dataStreamReadLoop keeps using a stream read handle after reading a FIN, which invalidates the handle under proxygen's WebTransport API. A remote peer can trigger the stale use by opening a data stream that names an unknown track alias and carries the FIN in the same write.","Type":"Description","Title":"CVE-2026-84894"}]}}}