{"id":"CVE-2026-12329","title":"Memory safety bug fixed in Thunderbird ESR 140.12","summary":"Memory safety bug fixed in Thunderbird ESR 140.12. This vulnerability was fixed in Firefox ESR 140.12 and Thunderbird 140.12.","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-119","CWE-416","CWE-476"],"vendor":"mozilla","product":"firefox","affected":["firefox >= 140.0, < 140.12.0","thunderbird >= 140.0, < 140.12.0"],"patched":["firefox 140.12.0","thunderbird 140.12.0"],"published":"2026-06-16","updated":"2026-07-07","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-12329","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2044738","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-58/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-61/","label":"security@mozilla.org"},{"url":"https://access.redhat.com/errata/RHSA-2026:27717","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:27733","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:27734","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:29940","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:30846","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:33445","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:36100","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:36101","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:36102","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:36103","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-12329","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2489214","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12329.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}],"tags":["nvd"],"epss":0.00313,"epssPercentile":0.24489,"ingestedAt":"2026-07-07T13:53:11.847Z","slug":"CVE-2026-12329","body":"## Overview\n\nMemory safety bug fixed in Thunderbird ESR 140.12. This vulnerability was fixed in Firefox ESR 140.12 and Thunderbird 140.12.\n\n## Affected\n\n- `firefox >= 140.0, < 140.12.0`\n- `thunderbird >= 140.0, < 140.12.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox 140.12.0`\n- `thunderbird 140.12.0`","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}