Mozilla Thunderbird vulnerabilities

CVE-2026-2797 [CRITICAL] CWE-416 CVE-2026-2797: Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 148 and Thun Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

CVE-2026-0879 [CRITICAL] CWE-119 CVE-2026-0879: Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability wa Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

CVE-2026-2767 [CRITICAL] CWE-416 CVE-2026-2767: Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 148 Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

CVE-2012-3963 [CRITICAL] CWE-416 CVE-2012-3963: Use-after-free vulnerability in the js::gc::MapAllocToTraceKind function in Mozilla Firefox before 1 Use-after-free vulnerability in the js::gc::MapAllocToTraceKind function in Mozilla Firefox before 15.0, Firefox ESR 10.x before 10.0.7, Thunderbird before 15.0, Thunderbird ESR 10.x before 10.0.7, and SeaMonkey before 2.12 allows remote attackers to execute arbitrary code via unspecified vectors.

CVE-2026-4720 [CRITICAL] CWE-120 CVE-2026-4720: Memory safety bugs present in Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird Memory safety bugs present in Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thun

CVE-2026-100788 [CRITICAL] CWE-824 CVE-2026-100788: Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ES Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.

CVE-2026-6748 [CRITICAL] CWE-457 CVE-2026-6748: Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firef Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

CVE-2012-3968 [CRITICAL] CWE-416 CVE-2012-3968: Use-after-free vulnerability in the WebGL implementation in Mozilla Firefox before 15.0, Firefox ESR Use-after-free vulnerability in the WebGL implementation in Mozilla Firefox before 15.0, Firefox ESR 10.x before 10.0.7, Thunderbird before 15.0, Thunderbird ESR 10.x before 10.0.7, and SeaMonkey before 2.12 allows remote attackers to execute arbitrary code via vectors related to deletion of a fragment shader by its accessor.

CVE-2026-2792 [CRITICAL] CWE-787 CVE-2026-2792: Memory safety bugs present in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird Memory safety bugs present in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thun

CVE-2026-100810 [CRITICAL] CWE-200 CVE-2026-100810: Other issue in the DevTools component. This vulnerability was fixed in Thunderbird 157 and Firefox 1 Other issue in the DevTools component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.

CVE-2026-5734 [CRITICAL] CWE-787 CVE-2026-5734: Memory safety bugs present in Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thun Memory safety bugs present in Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149.0.2, Firefox ESR 140.9.1, Thunde

CVE-2026-16387 [CRITICAL] CWE-200 CVE-2026-16387: Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 153, Firef Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

CVE-2011-2987 [CRITICAL] CWE-119 CVE-2011-2987: Heap-based buffer overflow in Almost Native Graphics Layer Engine (ANGLE), as used in the WebGL impl Heap-based buffer overflow in Almost Native Graphics Layer Engine (ANGLE), as used in the WebGL implementation in Mozilla Firefox 4.x through 5, Thunderbird before 6, SeaMonkey 2.x before 2.3, and possibly other products might allow remote attackers to execute arbitrary code via unspecified vectors.

CVE-2026-8953 [CRITICAL] CWE-416 CVE-2026-8953: Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

CVE-2025-6436 [HIGH] CWE-119 CVE-2025-6436: Memory safety bugs present in Firefox 139 and Thunderbird 139. Some of these bugs showed evidence of Memory safety bugs present in Firefox 139 and Thunderbird 139. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 140 and Thunderbird 140.

CVE-2026-109739 Mozilla Foundation Security Advisory 2026-109: CVE-2026-109739 Mozilla Foundation Security Advisory 2026-109 CVE: CVE-2026-109739 Product: Thunderbird Impact: low Fixed in: Thunderbird 158

CVE-2026-109743 Mozilla Foundation Security Advisory 2026-110: CVE-2026-109743 Mozilla Foundation Security Advisory 2026-110 CVE: CVE-2026-109743 Product: Thunderbird Impact: low Fixed in: Thunderbird 153.5

CVE-2026-109707 [CRITICAL] Mozilla Foundation Security Advisory 2026-110: CVE-2026-109707 Mozilla Foundation Security Advisory 2026-110 CVE: CVE-2026-109707 Product: Thunderbird Impact: low Fixed in: Thunderbird 153.5

CVE-2016-1522 [HIGH] CWE-119 CVE-2016-1522: Code.cpp in Libgraphite in Graphite 2 1.2.4, as used in Mozilla Firefox before 43.0 and Firefox ESR Code.cpp in Libgraphite in Graphite 2 1.2.4, as used in Mozilla Firefox before 43.0 and Firefox ESR 38.x before 38.6.1, does not consider recursive load calls during a size check, which allows remote attackers to cause a denial of service (heap-based buffer overflow) or possibly execute arbitrary code via a crafted Graphite smart font.

CVE-2026-100829 [CRITICAL] CWE-693 CVE-2026-100829: Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox ESR 153.4, Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.