{"api_version":"1","generated_at":"2026-09-02T03:58:50+00:00","cve":"CVE-2026-84142","urls":{"html":"https://cve.report/CVE-2026-84142","api":"https://cve.report/api/cve/CVE-2026-84142.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-84142","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-84142"},"summary":{"title":"Internally found bugs fixed in Thunderbird 155","description":"Internally found bugs present in Thunderbird 154. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155 and Thunderbird 155.","state":"PUBLISHED","assigner":"mozilla","published_at":"2026-09-01 13:20:08","updated_at":"2026-09-01 22:17:18"},"problem_types":[],"metrics":[],"references":[{"url":"https://bugzilla.mozilla.org/buglist.cgi?bug_id=2048796%2C2053150%2C2057356","name":"https://bugzilla.mozilla.org/buglist.cgi?bug_id=2048796%2C2053150%2C2057356","refsource":"security@mozilla.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029421%2C2040889%2C2045313%2C2045435%2C2053578%2C2058621%2C2058626","name":"https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029421%2C2040889%2C2045313%2C2045435%2C2053578%2C2058621%2C2058626","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.mozilla.org/security/advisories/mfsa2026-82/","name":"https://www.mozilla.org/security/advisories/mfsa2026-82/","refsource":"security@mozilla.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-84142","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-84142","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Mozilla","product":"Firefox","version":"unaffected 155 * rpm","platforms":[]},{"source":"CNA","vendor":"Mozilla","product":"Thunderbird","version":"unaffected 155 * rpm","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"CNA","value":"Alexandre Poirot, Christian Holler, Sebastian Hengst and the Mozilla Fuzzing Team","lang":"en"}],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"product":"Firefox","vendor":"Mozilla","versions":[{"lessThanOrEqual":"*","status":"unaffected","version":"155","versionType":"rpm"}]},{"product":"Thunderbird","vendor":"Mozilla","versions":[{"lessThanOrEqual":"*","status":"unaffected","version":"155","versionType":"rpm"}]}],"credits":[{"lang":"en","value":"Alexandre Poirot, Christian Holler, Sebastian Hengst and the Mozilla Fuzzing Team"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"Internally found bugs present in Thunderbird 154. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155 and Thunderbird 155."}],"value":"Internally found bugs present in Thunderbird 154. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155 and Thunderbird 155."}],"providerMetadata":{"dateUpdated":"2026-09-01T21:33:04.550Z","orgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","shortName":"mozilla"},"references":[{"name":"Moderate Severity internally found bugs fixed in Thunderbird 155","url":"https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029421%2C2040889%2C2045313%2C2045435%2C2053578%2C2058621%2C2058626"},{"name":"Low Severity internally found bugs fixed in Thunderbird 155","url":"https://bugzilla.mozilla.org/buglist.cgi?bug_id=2048796%2C2053150%2C2057356"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-82/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-86/"}],"title":"Internally found bugs fixed in Thunderbird 155"}},"cveMetadata":{"assignerOrgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","assignerShortName":"mozilla","cveId":"CVE-2026-84142","datePublished":"2026-09-01T12:19:09.109Z","dateReserved":"2026-09-01T07:26:00.760Z","dateUpdated":"2026-09-01T21:33:04.550Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-01 13:20:08","lastModifiedDate":"2026-09-01 22:17:18","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"84142","Ordinal":"1","Title":"Internally found bugs fixed in Thunderbird 155","CVE":"CVE-2026-84142","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"84142","Ordinal":"1","NoteData":"Internally found bugs present in Thunderbird 154. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155 and Thunderbird 155.","Type":"Description","Title":"Internally found bugs fixed in Thunderbird 155"}]}}}