{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-14899", "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "state": "PUBLISHED", "assignerShortName": "mozilla", "dateReserved": "2026-07-06T19:53:12.713Z", "datePublished": "2026-07-22T19:19:42.305Z", "dateUpdated": "2026-07-22T19:19:42.305Z"}, "containers": {"cna": {"affected": [{"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"status": "unaffected", "version": "140.13", "lessThanOrEqual": "140.*", "versionType": "rpm"}, {"status": "unaffected", "version": "153", "lessThanOrEqual": "*", "versionType": "rpm"}]}], "descriptions": [{"lang": "en", "value": "The code to parse MIME headers for display when forwarding a message (if the setting to view all headers was enabled) had an off-by-one error, allowing a single byte to be read from the memory after the buffer for the headers, and potentially crashing Thunderbird. This vulnerability was fixed in Thunderbird 153 and Thunderbird 140.13.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "The code to parse MIME headers for display when forwarding a message (if the setting to view all headers was enabled) had an off-by-one error, allowing a single byte to be read from the memory after the buffer for the headers, and potentially crashing Thunderbird. This vulnerability was fixed in Thunderbird 153 and Thunderbird 140.13."}]}], "title": "Off-by-one out of bounds read in MIME header parser for forwarding", "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2046137"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-71/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-72/"}], "credits": [{"lang": "en", "value": "Claude, Kai Engert"}], "providerMetadata": {"orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "shortName": "mozilla", "dateUpdated": "2026-07-22T19:19:42.305Z"}}}}

{}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[140.13,140.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[153,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Thunderbird", "source": "cna", "vendor": "Mozilla"}, "product": "thunderbird", "vendor": "mozilla"}], "created": "2026-07-23T08:30:04.606996+00:00", "updated": "2026-07-23T08:30:04.607045+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$thunderbird"]}