Mozilla Firefox/Thunderbird Security Advisory: Integer Overflow & Memory Safety Vulnerabilities (CVE-2026-5731 to 5735)

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Security AdvisoryHighMozilla

Affected:

Firefox ESR 115.34.0
Firefox ESR 140.9.0
Firefox 149.0.1
Firefox 149.1
Thunderbird ESR 140.9.0

Fixed in:

Firefox ESR 115.34.1
Firefox ESR 140.9.1
Firefox 149.0.2
Thunderbird ESR 140.9.1
Thunderbird 149.0.2

Referenced CVEs: CVE-2026-5735 CVE-2026-5734 CVE-2026-5733 CVE-2026-5732 CVE-2026-5731

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