{"id":"CVE-2026-92239","title":"A maliciously constructed IMAP line could cause an out-of-bounds buffer read","summary":"A maliciously constructed IMAP line could cause an out-of-bounds buffer read. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H","cwe":["CWE-125"],"vendor":"mozilla","product":"thunderbird","affected":["thunderbird < 140.16.0","thunderbird >= 141.0, < 153.3.0","thunderbird >= 154.0, < 156.0"],"patched":["thunderbird 156.0"],"published":"2026-09-15","updated":"2026-09-24","sourceUpdated":"2026-09-24T14:15:31.653","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92239","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2060488","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-94/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-95/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-96/","label":"security@mozilla.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92239.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-92239"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2534197"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-92239"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92239"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-95/#CVE-2026-92239"},{"url":"https://access.redhat.com/errata/RHSA-2026:70642"},{"url":"https://access.redhat.com/errata/RHSA-2026:73130"},{"url":"https://access.redhat.com/errata/RHSA-2026:73971"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00406,"epssPercentile":0.34652,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-22T15:33:06.433529Z"},"scores":{"nvd":8.1,"vendor":6.1,"adp":8.1},"ingestedAt":"2026-09-15T20:44:02.609Z","slug":"CVE-2026-92239","body":"## Overview\n\nA maliciously constructed IMAP line could cause an out-of-bounds buffer read. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.\n\n## Affected\n\n- `thunderbird < 140.16.0`\n- `thunderbird >= 141.0, < 153.3.0`\n- `thunderbird >= 154.0, < 156.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `thunderbird 156.0`\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 10 · updated 2026-09-30 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92239.json)\n- **RHSA-2026:70642** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-09-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:70642)\n- **RHSA-2026:73130** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-09-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:73130)\n- **RHSA-2026:73971** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-09-30 · [advisory](https://access.redhat.com/errata/RHSA-2026:73971)","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":209206,"id":"CVE-2026-92239","ts":1790096864771,"field":"cvss","old":"6.1","new":"8.1"},{"seq":209205,"id":"CVE-2026-92239","ts":1790096864771,"field":"severity","old":"medium","new":"high"},{"seq":206383,"id":"CVE-2026-92239","ts":1789663223934,"field":"cvss","old":null,"new":"6.1"},{"seq":206382,"id":"CVE-2026-92239","ts":1789663223934,"field":"severity","old":"none","new":"medium"}]}