{"id":"CVE-2026-103500","title":"An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size","summary":"An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size. This vulnerability was fixed in Thunderbird 157, Thunderbird 140.17, and Thunderbird 153.4.","severity":"none","vendor":"Mozilla","product":"Thunderbird","affected":["Thunderbird"],"published":"2026-09-30","updated":"2026-09-30","sourceUpdated":"2026-09-30T19:05:23.307","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-103500","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2070267","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-101/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-102/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-103/","label":"security@mozilla.org"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-30T18:17:24.565Z","slug":"CVE-2026-103500","body":"## Overview\n\nAn attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size. This vulnerability was fixed in Thunderbird 157, Thunderbird 140.17, and Thunderbird 153.4.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}