{"api_version":"1","generated_at":"2026-09-02T03:58:41+00:00","cve":"CVE-2026-84642","urls":{"html":"https://cve.report/CVE-2026-84642","api":"https://cve.report/api/cve/CVE-2026-84642.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-84642","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-84642"},"summary":{"title":"Allowed UNC hostnames for attachments interpreted as a regular expression","description":"The values of the mail.allowed_attachment_hostnames advanced config setting were used in a regular expression without escaping. For some possible valid hostnames, this could allow certain unintended hostnames to also match and serve remote attachments. This vulnerability was fixed in Thunderbird 155 and Thunderbird 153.2.","state":"PUBLISHED","assigner":"mozilla","published_at":"2026-09-01 22:17:20","updated_at":"2026-09-01 22:17:20"},"problem_types":[],"metrics":[],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2060462","name":"https://bugzilla.mozilla.org/show_bug.cgi?id=2060462","refsource":"security@mozilla.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-88/","name":"https://www.mozilla.org/security/advisories/mfsa2026-88/","refsource":"security@mozilla.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-86/","name":"https://www.mozilla.org/security/advisories/mfsa2026-86/","refsource":"security@mozilla.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-84642","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-84642","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Mozilla","product":"Thunderbird","version":"unaffected 153.2 153.* rpm","platforms":[]},{"source":"CNA","vendor":"Mozilla","product":"Thunderbird","version":"unaffected 155 * rpm","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"CNA","value":"ChinhNguyen, Lowk3yz","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":"153.*","status":"unaffected","version":"153.2","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"155","versionType":"rpm"}]}],"credits":[{"lang":"en","value":"ChinhNguyen, Lowk3yz"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"The values of the mail.allowed_attachment_hostnames advanced config setting were used in a regular expression without escaping. For some possible valid hostnames, this could allow certain unintended hostnames to also match and serve remote attachments. This vulnerability was fixed in Thunderbird 155 and Thunderbird 153.2."}],"value":"The values of the mail.allowed_attachment_hostnames advanced config setting were used in a regular expression without escaping. For some possible valid hostnames, this could allow certain unintended hostnames to also match and serve remote attachments. This vulnerability was fixed in Thunderbird 155 and Thunderbird 153.2."}],"providerMetadata":{"dateUpdated":"2026-09-01T21:44:16.162Z","orgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","shortName":"mozilla"},"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2060462"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-86/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-88/"}],"title":"Allowed UNC hostnames for attachments interpreted as a regular expression"}},"cveMetadata":{"assignerOrgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","assignerShortName":"mozilla","cveId":"CVE-2026-84642","datePublished":"2026-09-01T21:33:07.987Z","dateReserved":"2026-09-01T21:33:07.702Z","dateUpdated":"2026-09-01T21:44:16.162Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-01 22:17:20","lastModifiedDate":"2026-09-01 22:17:20","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"84642","Ordinal":"1","Title":"Allowed UNC hostnames for attachments interpreted as a regular e","CVE":"CVE-2026-84642","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"84642","Ordinal":"1","NoteData":"The values of the mail.allowed_attachment_hostnames advanced config setting were used in a regular expression without escaping. For some possible valid hostnames, this could allow certain unintended hostnames to also match and serve remote attachments. This vulnerability was fixed in Thunderbird 155 and Thunderbird 153.2.","Type":"Description","Title":"Allowed UNC hostnames for attachments interpreted as a regular e"}]}}}