{"api_version":"1","generated_at":"2026-10-01T23:19:08+00:00","cve":"CVE-2026-103500","urls":{"html":"https://cve.report/CVE-2026-103500","api":"https://cve.report/api/cve/CVE-2026-103500.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-103500","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-103500"},"summary":{"title":"Heap buffer overflow opening large email","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.","state":"PUBLISHED","assigner":"mozilla","published_at":"2026-09-30 18:18:18","updated_at":"2026-09-30 19:05:23"},"problem_types":[],"metrics":[],"references":[{"url":"https://www.mozilla.org/security/advisories/mfsa2026-102/","name":"https://www.mozilla.org/security/advisories/mfsa2026-102/","refsource":"security@mozilla.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-103/","name":"https://www.mozilla.org/security/advisories/mfsa2026-103/","refsource":"security@mozilla.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2070267","name":"https://bugzilla.mozilla.org/show_bug.cgi?id=2070267","refsource":"security@mozilla.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-101/","name":"https://www.mozilla.org/security/advisories/mfsa2026-101/","refsource":"security@mozilla.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-103500","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-103500","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Mozilla","product":"Thunderbird","version":"unaffected 140.17 140.* rpm","platforms":[]},{"source":"CNA","vendor":"Mozilla","product":"Thunderbird","version":"unaffected 153.4 153.* rpm","platforms":[]},{"source":"CNA","vendor":"Mozilla","product":"Thunderbird","version":"unaffected 157 * rpm","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"CNA","value":"Ahmed Albalawi","lang":"en"}],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"product":"Thunderbird","vendor":"Mozilla","versions":[{"lessThanOrEqual":"140.*","status":"unaffected","version":"140.17","versionType":"rpm"},{"lessThanOrEqual":"153.*","status":"unaffected","version":"153.4","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"157","versionType":"rpm"}]}],"credits":[{"lang":"en","value":"Ahmed Albalawi"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"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."}],"value":"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."}],"providerMetadata":{"dateUpdated":"2026-09-30T17:19:56.134Z","orgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","shortName":"mozilla"},"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2070267"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-101/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-102/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-103/"}],"title":"Heap buffer overflow opening large email"}},"cveMetadata":{"assignerOrgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","assignerShortName":"mozilla","cveId":"CVE-2026-103500","datePublished":"2026-09-30T17:15:06.357Z","dateReserved":"2026-09-30T17:15:06.146Z","dateUpdated":"2026-09-30T17:19:56.134Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-30 18:18:18","lastModifiedDate":"2026-09-30 19:05:23","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"103500","Ordinal":"1","Title":"Heap buffer overflow opening large email","CVE":"CVE-2026-103500","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"103500","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Heap buffer overflow opening large email"}]}}}