{"id":"CVE-2026-12300","title":"Memory safety bug fixed in Thunderbird 152","summary":"Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152 and Thunderbird 152.","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","cvssSource":"adp","vendor":"Mozilla","product":"Firefox","affected":["Firefox","Thunderbird"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-06-16T17:26:03.760142Z"},"published":"2026-06-16","updated":"2026-10-21","sourceUpdated":"2026-10-21T13:50:00.281Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-12300","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1704114"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-57/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-60/"}],"tags":["cve.org"],"epss":0.00252,"epssPercentile":0.15717,"ingestedAt":"2026-10-21T13:57:01.107Z","slug":"CVE-2026-12300","body":"## Overview\n\nMemory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152 and Thunderbird 152.\n\n## Affected\n\n- `Firefox`\n- `Thunderbird`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}