Thunderbird 143 Security Update: Sandbox Escape and Memory Safety Fixes

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Security Advisory High Mozilla

Affected:

Thunderbird < 143
Firefox ESR 140.3
Thunderbird ESR 140.3

Fixed in:

Thunderbird 143

Referenced CVEs: CVE-2025-10534 CVE-2025-10530 CVE-2025-10531 CVE-2025-10536 CVE-2025-10537 CVE-2025-10529 CVE-2025-10532 CVE-2025-10527 CVE-2025-10528 CVE-2025-10533

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Thunderbird 143 Security Update: Sandbox Escape and Memory Safety Fixes