{"id":"CVE-2026-74943","title":"Use-after-free in the Graphics: ImageLib component","summary":"Use-after-free in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-416","CWE-416"],"vendor":"mozilla","product":"firefox","affected":["firefox < 115.39.0","firefox >= 116.0, < 140.14.0","firefox >= 141.0, < 153.1.0","thunderbird < 140.14.0","thunderbird >= 141.0, < 153.1.0"],"patched":["firefox 153.1.0","thunderbird 153.1.0"],"published":"2026-08-18","updated":"2026-08-21","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74943","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2057308","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-74/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-75/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-76/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-77/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-78/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-79/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-80/","label":"security@mozilla.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74943.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-74943"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2517826"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74943"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74943"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-76/#CVE-2026-74943"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-79/#CVE-2026-74943"},{"url":"https://access.redhat.com/errata/RHSA-2026:64813"},{"url":"https://access.redhat.com/errata/RHSA-2026:58899"},{"url":"https://access.redhat.com/errata/RHSA-2026:58898"},{"url":"https://access.redhat.com/errata/RHSA-2026:65111"},{"url":"https://access.redhat.com/errata/RHSA-2026:64814"},{"url":"https://access.redhat.com/errata/RHSA-2026:58897"},{"url":"https://access.redhat.com/errata/RHSA-2026:65442"},{"url":"https://access.redhat.com/errata/RHSA-2026:65110"},{"url":"https://access.redhat.com/errata/RHSA-2026:65105"},{"url":"https://access.redhat.com/errata/RHSA-2026:65669"},{"url":"https://access.redhat.com/errata/RHSA-2026:65103"},{"url":"https://access.redhat.com/errata/RHSA-2026:65670"},{"url":"https://access.redhat.com/errata/RHSA-2026:65158"},{"url":"https://access.redhat.com/errata/RHSA-2026:65888"},{"url":"https://access.redhat.com/errata/RHSA-2026:65766"}],"tags":["nvd","exploit-available","csaf","vex","red-hat","score-dispute"],"epss":0.0057,"epssPercentile":0.45647,"ingestedAt":"2026-08-22T13:32:36.490Z","exploits":{"github":1,"githubRepos":["https://github.com/defineid/Revenant"],"checkedAt":"2026-09-21T15:30:34.767Z"},"exploitAvailable":true,"scores":{"nvd":9.8,"vendor":7.5},"slug":"CVE-2026-74943","body":"## Overview\n\nUse-after-free in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.\n\n## Affected\n\n- `firefox < 115.39.0`\n- `firefox >= 116.0, < 140.14.0`\n- `firefox >= 141.0, < 153.1.0`\n- `thunderbird < 140.14.0`\n- `thunderbird >= 141.0, < 153.1.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox 153.1.0`\n- `thunderbird 153.1.0`\n\n## Vendor advisories\n\n- **RHSA-2026:64813** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:64813)\n- **RHSA-2026:58899** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-08-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:58899)\n- **RHSA-2026:58898** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-08-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:58898)\n- **RHSA-2026:65111** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65111)\n- **RHSA-2026:64814** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:64814)\n- **RHSA-2026:58897** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-08-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:58897)\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8 · updated 2026-09-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74943.json)\n- **RHSA-2026:65442** · Red Hat · fixed in: Red Hat Enterprise Linux Server (v. 7 ELS) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65442)\n- **RHSA-2026:65110** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65110)\n- **RHSA-2026:65105** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65105)\n- **RHSA-2026:65669** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65669)\n- **RHSA-2026:65103** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65103)\n- **RHSA-2026:65670** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65670)\n- **RHSA-2026:65888** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-09-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:65888)\n- **RHSA-2026:65766** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-09-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:65766)","depth":"abyssal","depthScore":66,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":5471,"id":"CVE-2026-74943","ts":1788887286842,"field":"exploit_available","old":"false","new":"true"},{"seq":4354,"id":"CVE-2026-74943","ts":1788886400012,"field":"exploit_available","old":"true","new":"false"},{"seq":3078,"id":"CVE-2026-74943","ts":1788883063294,"field":"exploit_available","old":"false","new":"true"},{"seq":2107,"id":"CVE-2026-74943","ts":1788882468077,"field":"exploit_available","old":"true","new":"false"},{"seq":1173,"id":"CVE-2026-74943","ts":1788881905085,"field":"exploit_available","old":"false","new":"true"}]}