{"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":"low","cvss":3.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N","cwe":["CWE-125"],"vendor":"Mozilla","product":"Thunderbird","affected":["Thunderbird"],"published":"2026-09-15","updated":"2026-09-16","sourceUpdated":"2026-09-16T19:34:05.910","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"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"cvssSource":"vendor","ingestedAt":"2026-09-15T20:44:02.609Z","epss":0.00215,"epssPercentile":0.12133,"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## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\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, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, … · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92240.json)","depth":"sunlit","depthScore":19,"depthScoreParts":{"impact":18.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"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"}]}