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Known vulnerabilities in Mozilla Thunderbird

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CVE Summary Score Published
CVE-2026-109730 Integer overflow in the Graphics component 8.8 High Oct 13, 2026
CVE-2026-109722 JIT miscompilation in the JavaScript Engine: JIT component 8.1 High Oct 13, 2026
CVE-2026-109725 Use-after-free in the DOM: Core & HTML component 5.4 Medium Oct 13, 2026
CVE-2026-109726 Use-after-free in the SVG component 5.4 Medium Oct 13, 2026
CVE-2026-109719 Race condition, use-after-free in the Graphics: CanvasWebGL component 4.2 Medium Oct 13, 2026
CVE-2026-109712 Sandbox escape due to uninitialized memory in the Graphics component 7.1 High Oct 13, 2026
CVE-2026-109715 Incorrect boundary conditions in the JavaScript Engine component 8.1 High Oct 13, 2026
CVE-2026-109716 Incorrect boundary conditions in the JavaScript Engine component 8.1 High Oct 13, 2026
CVE-2026-109718 Use-after-free in the XML component 5.4 Medium Oct 13, 2026
CVE-2026-109706 Use-after-free in the Storage: IndexedDB component 5.4 Medium Oct 13, 2026
CVE-2026-109710 Use-after-free in the Graphics: Text component 5.4 Medium Oct 13, 2026
CVE-2026-106016 Mitigation bypass in the File Handling component 9.8 Critical Oct 6, 2026
CVE-2026-103500 An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB… 6.3 Medium Sep 30, 2026
CVE-2026-100831 Use-after-free in the DOM: UI Events & Focus Handling component 8.8 High Sep 29, 2026
CVE-2026-100832 Use-after-free in the Graphics: Canvas2D component 8.8 High Sep 29, 2026
CVE-2026-100829 Mitigation bypass in the DOM: Security component 9.6 Critical Sep 29, 2026
CVE-2026-100830 Mitigation bypass in the DOM: Navigation component 8.1 High Sep 29, 2026
CVE-2026-100826 Denial-of-service in the Storage: StorageManager component 6.5 Medium Sep 29, 2026
CVE-2026-100828 Mitigation bypass in the Bookmarks & History component 9.6 Critical Sep 29, 2026
CVE-2026-100824 Privilege escalation in the Places component 8.8 High Sep 29, 2026
CVE-2026-100825 Use-after-free in the JavaScript Engine: JIT component 8.8 High Sep 29, 2026
CVE-2026-100821 Site isolation issue in the Panning and Zooming component 4.7 Medium Sep 29, 2026
CVE-2026-100822 Spoofing issue in the Networking: HTTP component 5.4 Medium Sep 29, 2026
CVE-2026-100819 Sandbox escape due to incorrect boundary conditions in the XPCOM component 9.6 Critical Sep 29, 2026
CVE-2026-100820 Privilege escalation in the Address Bar component 8.8 High Sep 29, 2026

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