Debian Thunderbird vulnerabilities

CVE-2026-2760 [CRITICAL] CVE-2026-2760: firefox - Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender c... Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. Scope: local sid: resolved (fixed in 148.0-1)

CVE-2025-6424 [CRITICAL] CVE-2025-6424: firefox - A use-after-free in FontFaceSet resulted in a potentially exploitable crash. Thi... A use-after-free in FontFaceSet resulted in a potentially exploitable crash. This vulnerability affects Firefox < 140, Firefox ESR < 115.25, Firefox ESR < 128.12, Thunderbird < 140, and Thunderbird < 128.12. Scope: local sid: resolved (fixed in 140.0-1)

CVE-2026-2778 [CRITICAL] CVE-2026-2778: firefox - Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML comp... Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. Scope: local sid: resolved (fixed in 148.0-1)

CVE-2026-2784 [CRITICAL] CVE-2026-2784: firefox - Mitigation bypass in the DOM: Security component. This vulnerability affects Fir... Mitigation bypass in the DOM: Security component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. Scope: local sid: resolved (fixed in 148.0-1)

CVE-2025-4919 [HIGH] CVE-2025-4919: firefox - An attacker was able to perform an out-of-bounds read or write on a JavaScript o... An attacker was able to perform an out-of-bounds read or write on a JavaScript object by confusing array index sizes. This vulnerability affects Firefox < 138.0.4, Firefox ESR < 128.10.1, Firefox ESR < 115.23.1, Thunderbird < 128.10.2, and Thunderbird < 138.0.2. Scope: local sid: resolved (fixed in 138.0.4-1)

CVE-2021-4140 [CRITICAL] CVE-2021-4140: firefox - It was possible to construct specific XSLT markup that would be able to bypass a... It was possible to construct specific XSLT markup that would be able to bypass an iframe sandbox. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5. Scope: local sid: resolved (fixed in 96.0-1)

CVE-2026-4689 [CRITICAL] CVE-2026-4689: firefox - Sandbox escape due to incorrect boundary conditions, integer overflow in the XPC... Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9. Scope: local sid: resolved (fixed in 149.0-1)

CVE-2020-6811 [HIGH] CVE-2020-6811: firefox - The 'Copy as cURL' feature of Devtools' network tab did not properly escape the ... The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP method of a request, which can be controlled by the website. If a user used the 'Copy as Curl' feature and pasted the command into a terminal, it could have resulted in command injection and arbitrary command execution. This vulnerability affects Thunderbird < 68.6, Firefox < 74, Fire

CVE-2025-14321 [CRITICAL] CVE-2025-14321: firefox - Use-after-free in the WebRTC: Signaling component. This vulnerability affects Fi... Use-after-free in the WebRTC: Signaling component. This vulnerability affects Firefox < 146, Firefox ESR < 140.6, Thunderbird < 146, and Thunderbird < 140.6. Scope: local sid: resolved (fixed in 146.0-1)

CVE-2026-4701 [CRITICAL] CVE-2026-4701: firefox - Use-after-free in the JavaScript Engine component. This vulnerability affects Fi... Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9. Scope: local sid: resolved (fixed in 149.0-1)

CVE-2026-4700 [CRITICAL] CVE-2026-4700: firefox - Mitigation bypass in the Networking: HTTP component. This vulnerability affects ... Mitigation bypass in the Networking: HTTP component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9. Scope: local sid: resolved (fixed in 149.0-1)

CVE-2026-4717 [CRITICAL] CVE-2026-4717: firefox - Privilege escalation in the Netmonitor component. This vulnerability affects Fir... Privilege escalation in the Netmonitor component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9. Scope: local sid: resolved (fixed in 149.0-1)

CVE-2026-2780 [CRITICAL] CVE-2026-2780: firefox - Privilege escalation in the Netmonitor component. This vulnerability affects Fir... Privilege escalation in the Netmonitor component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. Scope: local sid: resolved (fixed in 148.0-1)

CVE-2026-2789 [CRITICAL] CVE-2026-2789: firefox - Use-after-free in the Graphics: ImageLib component. This vulnerability affects F... Use-after-free in the Graphics: ImageLib component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. Scope: local sid: resolved (fixed in 148.0-1)

CVE-2026-2786 [CRITICAL] CVE-2026-2786: firefox - Use-after-free in the JavaScript Engine component. This vulnerability affects Fi... Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. Scope: local sid: resolved (fixed in 148.0-1)

CVE-2026-2782 [CRITICAL] CVE-2026-2782: firefox - Privilege escalation in the Netmonitor component. This vulnerability affects Fir... Privilege escalation in the Netmonitor component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. Scope: local sid: resolved (fixed in 148.0-1)

CVE-2026-2779 [CRITICAL] CVE-2026-2779: firefox - Incorrect boundary conditions in the Networking: JAR component. This vulnerabili... Incorrect boundary conditions in the Networking: JAR component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. Scope: local sid: resolved (fixed in 148.0-1)

CVE-2026-2766 [CRITICAL] CVE-2026-2766: firefox - Use-after-free in the JavaScript Engine: JIT component. This vulnerability affec... Use-after-free in the JavaScript Engine: JIT component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. Scope: local sid: resolved (fixed in 148.0-1)

CVE-2026-2765 [CRITICAL] CVE-2026-2765: firefox - Use-after-free in the JavaScript Engine component. This vulnerability affects Fi... Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. Scope: local sid: resolved (fixed in 148.0-1)

CVE-2026-0884 [CRITICAL] CVE-2026-0884: firefox - Use-after-free in the JavaScript Engine component. This vulnerability affects Fi... Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7. Scope: local sid: resolved (fixed in 147.0-1)