{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-4691","assignerOrgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","state":"PUBLISHED","assignerShortName":"mozilla","dateReserved":"2026-03-23T23:21:44.154Z","datePublished":"2026-03-24T12:30:24.376Z","dateUpdated":"2026-05-07T14:50:45.605Z"},"containers":{"cna":{"affected":[{"product":"Firefox","vendor":"Mozilla","versions":[{"status":"unaffected","version":"115.34","lessThanOrEqual":"115.*","versionType":"rpm"},{"status":"unaffected","version":"140.9","lessThanOrEqual":"140.*","versionType":"rpm"},{"status":"unaffected","version":"149","lessThanOrEqual":"*","versionType":"rpm"}]},{"product":"Thunderbird","vendor":"Mozilla","versions":[{"status":"unaffected","version":"140.9","lessThanOrEqual":"140.*","versionType":"rpm"},{"status":"unaffected","version":"149","lessThanOrEqual":"*","versionType":"rpm"}]}],"descriptions":[{"lang":"en","value":"Use-after-free in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.","supportingMedia":[{"type":"text/html","base64":false,"value":"Use-after-free in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9."}]}],"title":"Use-after-free in the CSS Parsing and Computation component","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2017512"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-20/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-21/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-22/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-23/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-24/"}],"credits":[{"lang":"en","value":"Fabius Artrel"}],"providerMetadata":{"orgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","shortName":"mozilla","dateUpdated":"2026-04-13T13:48:42.999Z"}},"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":9.8,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-03-26T12:49:03.878448Z","id":"CVE-2026-4691","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-05-07T14:50:45.605Z"}}]}}