Vulnerability Details CVE-2026-100794
Sandbox escape due to incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 26.2%
CVSS Severity
CVSS v3 Score 9.6
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2028871
- https://www.mozilla.org/security/advisories/mfsa2026-100/
- https://www.mozilla.org/security/advisories/mfsa2026-101/
- https://www.mozilla.org/security/advisories/mfsa2026-102/
- https://www.mozilla.org/security/advisories/mfsa2026-103/
- https://www.mozilla.org/security/advisories/mfsa2026-97/
- https://www.mozilla.org/security/advisories/mfsa2026-99/
Products affected by CVE-2026-100794
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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:147.0.1
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cpe:2.3:a:mozilla:thunderbird:147.0.2
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cpe:2.3:a:mozilla:thunderbird:148.0
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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:149.0.1
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cpe:2.3:a:mozilla:thunderbird:149.0.2
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cpe:2.3:a:mozilla:thunderbird:150.0
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cpe:2.3:a:mozilla:thunderbird:150.0.1
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cpe:2.3:a:mozilla:thunderbird:150.0.2
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cpe:2.3:a:mozilla:thunderbird:151.0.0
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cpe:2.3:a:mozilla:thunderbird:151.0.1
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cpe:2.3:a:mozilla:thunderbird:152.0.0
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cpe:2.3:a:mozilla:thunderbird:152.0.1
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cpe:2.3:a:mozilla:thunderbird:153.0
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cpe:2.3:a:mozilla:thunderbird:153.0.1
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cpe:2.3:a:mozilla:thunderbird:153.0.2
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cpe:2.3:a:mozilla:thunderbird:153.0.3
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cpe:2.3:a:mozilla:thunderbird:153.1.0
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cpe:2.3:a:mozilla:thunderbird:153.1.1
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cpe:2.3:a:mozilla:thunderbird:153.2.0
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cpe:2.3:a:mozilla:thunderbird:153.3.0
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cpe:2.3:a:mozilla:thunderbird:153.3.1
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cpe:2.3:a:mozilla:thunderbird:154.0
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cpe:2.3:a:mozilla:thunderbird:155.0
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cpe:2.3:a:mozilla:thunderbird:155.0.1
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cpe:2.3:a:mozilla:thunderbird:156.0
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cpe:2.3:a:mozilla:thunderbird:156.0.1