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This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8."}],"providerMetadata":{"dateUpdated":"2026-04-13T13:52:19.199Z","orgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","shortName":"mozilla"},"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2009608"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-13/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-14/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-15/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-16/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-17/"}],"title":"Use-after-free in the JavaScript: GC component"}},"cveMetadata":{"assignerOrgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","assignerShortName":"mozilla","cveId":"CVE-2026-2758","datePublished":"2026-02-24T13:32:58.501Z","dateReserved":"2026-02-19T15:05:18.397Z","dateUpdated":"2026-07-15T01:14:08.473Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-02-24 14:16:24","lastModifiedDate":"2026-07-15 02:19:33","problem_types":["CWE-416","CWE-416 CWE-416 Use After Free"],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.9},{"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:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.9},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.6,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-02-26T15:44:21.619796Z","id":"CVE-2026-2758","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*","versionEndExcluding":"115.33.0","matchCriteriaId":"1B590E0E-4C6F-4F2A-A0FF-9BEDA1A36D17"},{"vulnerable":true,"criteria":"cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*","versionEndExcluding":"148.0","matchCriteriaId":"3D8676DB-4A12-41A0-A1A5-2DED97287973"},{"vulnerable":true,"criteria":"cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*","versionStartIncluding":"128.0","versionEndExcluding":"140.8.0","matchCriteriaId":"AE16902C-47B5-438D-A4A5-770C08223931"},{"vulnerable":true,"criteria":"cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*","versionEndExcluding":"140.8.0","matchCriteriaId":"73228A3D-A71B-497B-A5BA-412FFE9F6F37"},{"vulnerable":true,"criteria":"cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*","versionEndExcluding":"148.0","matchCriteriaId":"C5EBE90D-1996-4578-B715-605B24E66C59"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"2758","Ordinal":"1","Title":"Use-after-free in the JavaScript: GC component","CVE":"CVE-2026-2758","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"2758","Ordinal":"1","NoteData":"Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.","Type":"Description","Title":"Use-after-free in the JavaScript: GC component"}]}}}