{"id":"CVE-2026-92238","title":"A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations","summary":"A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.","severity":"medium","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-2026-92238","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2060601","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-2026-92238.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-92238"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2534199"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-92238"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92238"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-95/#CVE-2026-92238"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-09-15T20:44:02.608Z","cvss":6.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cvssSource":"vendor","cwe":["CWE-843"],"epss":0.00181,"epssPercentile":0.07899,"slug":"CVE-2026-92238","body":"## Overview\n\nA maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. 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** · Moderate · 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-2026-92238.json)","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":33.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":206381,"id":"CVE-2026-92238","ts":1789663223896,"field":"cvss","old":null,"new":"6.1"},{"seq":206380,"id":"CVE-2026-92238","ts":1789663223896,"field":"severity","old":"none","new":"medium"}]}