{"id":"CVE-2026-92240","title":"A malicious or compromised IMAP server can trigger an out-of-bounds read in the IMAP response parser by sending an untagged '* ID' response, crashing Thunderbird","summary":"A malicious or compromised IMAP server can trigger an out-of-bounds read in the IMAP response parser by sending an untagged '* ID' response, crashing Thunderbird. The affected parsing path is reachable before authentication. This vulnera…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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":"2026-09-24T14:15:03.237","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92240","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2069113","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-2026-92240.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-92240"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2534187"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-92240"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92240"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-95/#CVE-2026-92240"},{"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":0.00628,"epssPercentile":0.49908,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-22T15:41:57.658626Z"},"scores":{"nvd":9.1,"vendor":3.4,"adp":9.1},"ingestedAt":"2026-09-15T20:44:02.609Z","slug":"CVE-2026-92240","body":"## Overview\n\nA malicious or compromised IMAP server can trigger an out-of-bounds read in the IMAP response parser by sending an untagged '* ID' response, crashing Thunderbird. The affected parsing path is reachable before authentication. 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** · Low · 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-2026-92240.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":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":209208,"id":"CVE-2026-92240","ts":1790096864887,"field":"cvss","old":"3.4","new":"9.1"},{"seq":209207,"id":"CVE-2026-92240","ts":1790096864887,"field":"severity","old":"low","new":"critical"},{"seq":205443,"id":"CVE-2026-92240","ts":1789576717378,"field":"cvss","old":null,"new":"3.4"},{"seq":205442,"id":"CVE-2026-92240","ts":1789576717378,"field":"severity","old":"none","new":"low"}]}