Vulnerability Details CVE-2026-12298
Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 22.4%
CVSS Severity
CVSS v3 Score 5.4
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2041981
- https://www.mozilla.org/security/advisories/mfsa2026-57/
- https://www.mozilla.org/security/advisories/mfsa2026-58/
- https://www.mozilla.org/security/advisories/mfsa2026-60/
- https://www.mozilla.org/security/advisories/mfsa2026-61/
- https://access.redhat.com/errata/RHSA-2026:27717
- https://access.redhat.com/errata/RHSA-2026:27733
- https://access.redhat.com/errata/RHSA-2026:27734
- https://access.redhat.com/errata/RHSA-2026:29940
- https://access.redhat.com/errata/RHSA-2026:30846
- https://access.redhat.com/errata/RHSA-2026:33445
- https://access.redhat.com/errata/RHSA-2026:36100
- https://access.redhat.com/errata/RHSA-2026:36101
- https://access.redhat.com/errata/RHSA-2026:36102
- https://access.redhat.com/errata/RHSA-2026:36103
- https://access.redhat.com/security/cve/CVE-2026-12298
- https://bugzilla.redhat.com/show_bug.cgi?id=2489248
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12298.json
Products affected by CVE-2026-12298
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cpe:2.3:a:mozilla:thunderbird:-
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cpe:2.3:a:mozilla:thunderbird:135.0
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cpe:2.3:a:mozilla:thunderbird:139.0
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cpe:2.3:a:mozilla:thunderbird:140.0
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cpe:2.3:a:mozilla:thunderbird:140.0.1
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cpe:2.3:a:mozilla:thunderbird:140.1.0
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cpe:2.3:a:mozilla:thunderbird:140.1.1
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cpe:2.3:a:mozilla:thunderbird:140.10.1
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cpe:2.3:a:mozilla:thunderbird:140.2.0
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cpe:2.3:a:mozilla:thunderbird:140.2.1
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cpe:2.3:a:mozilla:thunderbird:140.3.0
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cpe:2.3:a:mozilla:thunderbird:140.3.1
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cpe:2.3:a:mozilla:thunderbird:140.4.0
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cpe:2.3:a:mozilla:thunderbird:140.5.0
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cpe:2.3:a:mozilla:thunderbird:140.6.0
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cpe:2.3:a:mozilla:thunderbird:140.7.0
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cpe:2.3:a:mozilla:thunderbird:140.8.1
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cpe:2.3:a:mozilla:thunderbird:140.9.0
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cpe:2.3:a:mozilla:thunderbird:140.9.1
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cpe:2.3:a:mozilla:thunderbird:141.0
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cpe:2.3:a:mozilla:thunderbird:142.0
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cpe:2.3:a:mozilla:thunderbird:143.0
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cpe:2.3:a:mozilla:thunderbird:143.0.1
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cpe:2.3:a:mozilla:thunderbird:144.0
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cpe:2.3:a:mozilla:thunderbird:144.0.1
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cpe:2.3:a:mozilla:thunderbird:145.0
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cpe:2.3:a:mozilla:thunderbird:146.0
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cpe:2.3:a:mozilla:thunderbird:146.0.1
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cpe:2.3:a:mozilla:thunderbird:147.0
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cpe:2.3:a:mozilla:thunderbird:148.0.1
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cpe:2.3:a:mozilla:thunderbird:149.0
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cpe:2.3:a:mozilla:thunderbird:149.0.2