{"id":"CVE-2026-103500","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-103500","generatedAt":"2026-10-28T08:11:03.814Z","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.","description":"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.","published":"2026-09-30T18:18:18.000Z","lastModified":"2026-10-16T19:17:02.000Z","status":"Modified","sourceIdentifier":"security@mozilla.org","cvss":{"version":"3.1","score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H"},"cwe":["CWE-787","CWE-122"],"affected":["mozilla/thunderbird"],"epss":{"score":0.00277,"percentile":0.20021,"date":"2026-10-27","history":[{"date":"2026-10-01","score":0.00195,"percentile":0.08241}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.28%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"scored","label":"Newly scored","at":"2026-10-15T16:15:11.000Z","detail":{"from":null,"score":"6.1","severity":"MEDIUM","fromSeverity":null},"summary":"Now scored CVSS 6.1 MEDIUM."},{"kind":"new","label":"New CVE","at":"2026-09-30T18:18:18.000Z","detail":{"score":null,"severity":null,"publishedAt":"2026-09-30T18:18:18.120Z"},"summary":"New CVE, medium severity (CVSS 6.1)."}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2070267","tags":["Permissions Required"],"source":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-101/","tags":["Vendor Advisory"],"source":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-102/","tags":["Vendor Advisory"],"source":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-103/","tags":["Vendor Advisory"],"source":"security@mozilla.org"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-103500","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}