{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-4371","assignerOrgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","state":"PUBLISHED","assignerShortName":"mozilla","dateReserved":"2026-03-18T10:03:43.909Z","datePublished":"2026-03-24T20:27:15.198Z","dateUpdated":"2026-04-13T13:51:25.535Z"},"containers":{"cna":{"affected":[{"product":"Thunderbird","vendor":"Mozilla","versions":[{"status":"unaffected","version":"140.9","lessThanOrEqual":"140.*","versionType":"rpm"},{"status":"unaffected","version":"149","lessThanOrEqual":"*","versionType":"rpm"}]}],"descriptions":[{"lang":"en","value":"A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.","supportingMedia":[{"type":"text/html","base64":false,"value":"A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9."}]}],"title":"Out of bounds read in IMAP parsing","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2023493"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-23/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-24/"}],"credits":[{"lang":"en","value":"Rintaro Kobayashi"}],"providerMetadata":{"orgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","shortName":"mozilla","dateUpdated":"2026-04-13T13:51:25.535Z"}},"adp":[{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-126","lang":"en","description":"CWE-126 Buffer Over-read"}]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.4,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"HIGH","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-03-25T16:24:48.052212Z","id":"CVE-2026-4371","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-03-25T16:24:50.635Z"}}]}}