{"id":"CVE-2026-92238","state":"PUBLISHED","title":"Ambiguous parsing of mail headers","description":"A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.","publishedAt":"2026-09-15T19:42:51.331Z","updatedAt":"2026-09-22T18:43:25.798Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"CISA-ADP"},"assigner":"mozilla","products":["Mozilla Thunderbird"],"affected":[{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"140.16","status":"unaffected","lessThanOrEqual":"140.*","versionType":"rpm"},{"version":"153.3","status":"unaffected","lessThanOrEqual":"153.*","versionType":"rpm"},{"version":"156","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]}],"references":["https://bugzilla.mozilla.org/show_bug.cgi?id=2060601","https://www.mozilla.org/security/advisories/mfsa2026-94/","https://www.mozilla.org/security/advisories/mfsa2026-95/","https://www.mozilla.org/security/advisories/mfsa2026-96/"],"weaknesses":["CWE-444"],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/92xxx/CVE-2026-92238.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-92238","state":"PUBLISHED","datePublished":"2026-09-15T19:42:51.331Z","dateUpdated":"2026-09-22T18:43:25.798Z","assignerShortName":"mozilla","assignerOrgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateReserved":"2026-09-15T19:42:50.750Z"},"containers":{"cna":{"title":"Ambiguous parsing of mail headers","descriptions":[{"lang":"en","value":"A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3."}],"affected":[{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"140.16","status":"unaffected","lessThanOrEqual":"140.*","versionType":"rpm"},{"version":"153.3","status":"unaffected","lessThanOrEqual":"153.*","versionType":"rpm"},{"version":"156","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2060601"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-94/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-95/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-96/"}],"providerMetadata":{"shortName":"mozilla","orgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateUpdated":"2026-09-16T14:24:28.700Z"},"credits":[{"lang":"en","value":"Ramesh Adhikari, Dr. Faruk Kazi (CoE-CNDS Lab, VJTI, Mumbai, India)"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":9.8,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-09-22T18:43:18.822790Z","id":"CVE-2026-92238","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-444","type":"CWE","lang":"en","description":"CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-22T18:43:25.798Z"}}]}}}