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• Critical 9.8
  CVE-2026-74943 Public exploit

  Use-after-free in the Graphics: ImageLib component

  Use-after-free in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

  Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu
  Aug 18, 2026
• Critical 9.8
  CVE-2026-74936 Public exploit

  Use-after-free in the JavaScript: WebAssembly component

  Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

  Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu
  Aug 18, 2026
• Critical 9.6
  CVE-2026-12295 Public exploit

  Sandbox escape in the DOM: Navigation component

  Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

  Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu
  Jun 16, 2026
• Critical 9.6
  CVE-2026-4692 Public exploit

  Sandbox escape in the Responsive Design Mode component

  Sandbox escape in the Responsive Design Mode component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

  Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu
  Mar 24, 2026
• Critical 9.8
  CVE-2026-2766 Public exploit

  Use-after-free in the JavaScript Engine: JIT component

  Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

  Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu
  Feb 24, 2026
• Critical 9.8
  CVE-2026-2764 Public exploit

  JIT miscompilation, use-after-free in the JavaScript Engine: JIT component

  JIT miscompilation, use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

  Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu
  Feb 24, 2026
• Critical 9.8
  CVE-2026-2763 Public exploit

  Use-after-free in the JavaScript Engine component

  Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

  Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu
  Feb 24, 2026
• Critical 9.8
  CVE-2025-14321 Public exploit

  Use-after-free in the WebRTC: Signaling component

  Use-after-free in the WebRTC: Signaling component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

  Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu
  Dec 9, 2025
• Critical 9.8
  CVE-2024-9680 Exploited · Ransomware Public exploit EPSS 23%

  An attacker was able to achieve code execution in the content process by exploiting a use-after-free in Animation timel…

  Mozilla Firefox Thunderbird Firefox ESR Browsers Debian Ubuntu Alpine
  Oct 9, 2024

  KEV Oct 15, 2024
• Critical 9.8
  CVE-2024-8381 Public exploit

  A potentially exploitable type confusion could be triggered when looking up a property name on an object being used as …

  Mozilla Firefox Thunderbird Firefox ESR Browsers Debian Ubuntu
  Sep 3, 2024
• Critical 10.0
  CVE-2019-11708 Exploited Public exploit EPSS 56%

  Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can resul…

  Mozilla Firefox Thunderbird Firefox ESR Browsers Debian Ubuntu Alpine
  Jul 23, 2019

  KEV May 23, 2022