Mozilla Thunderbird vulnerabilities

CVE-2009-2462 [CRITICAL] CWE-399 CVE-2009-2462: The browser engine in Mozilla Firefox before 3.0.12 and Thunderbird allows remote attackers to cause The browser engine in Mozilla Firefox before 3.0.12 and Thunderbird allows remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via vectors related to (1) the frame chain and synchronous events, (2) a SetMayHaveFrame assertion and nsCSSFrameConstructor::CreateFloatingLetterFrame,

CVE-2026-109754 Mozilla Foundation Security Advisory 2026-110: CVE-2026-109754 Mozilla Foundation Security Advisory 2026-110 CVE: CVE-2026-109754 Product: Thunderbird Impact: low Fixed in: Thunderbird 153.5

CVE-2026-109736 Mozilla Foundation Security Advisory 2026-109: CVE-2026-109736 Mozilla Foundation Security Advisory 2026-109 CVE: CVE-2026-109736 Product: Thunderbird Impact: low Fixed in: Thunderbird 158

CVE-2016-9905 [HIGH] CWE-284 CVE-2016-9905: A potentially exploitable crash in "EnumerateSubDocuments" while adding or removing sub-documents. T A potentially exploitable crash in "EnumerateSubDocuments" while adding or removing sub-documents. This vulnerability affects Firefox ESR < 45.6 and Thunderbird < 45.6.

CVE-2026-109715 Mozilla Foundation Security Advisory 2026-110: CVE-2026-109715 Mozilla Foundation Security Advisory 2026-110 CVE: CVE-2026-109715 Product: Thunderbird Impact: low Fixed in: Thunderbird 153.5

CVE-2026-109716 Mozilla Foundation Security Advisory 2026-109: CVE-2026-109716 Mozilla Foundation Security Advisory 2026-109 CVE: CVE-2026-109716 Product: Thunderbird Impact: low Fixed in: Thunderbird 158

CVE-2011-2982 [CRITICAL] CVE-2011-2982: Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 3.6.20, Thunder Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 3.6.20, Thunderbird 2.x and 3.x before 3.1.12, SeaMonkey 1.x and 2.x, and possibly other products allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown vectors.

CVE-2012-3983 [CRITICAL] CWE-119 CVE-2012-3983: Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 16.0, Thunderbi Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 16.0, Thunderbird before 16.0, and SeaMonkey before 2.13 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown vectors.

CVE-2026-109759 Mozilla Foundation Security Advisory 2026-110: CVE-2026-109759 Mozilla Foundation Security Advisory 2026-110 CVE: CVE-2026-109759 Product: Thunderbird Impact: low Fixed in: Thunderbird 153.5

CVE-2020-12426 [HIGH] CVE-2020-12426: Mozilla developers and community members reported memory safety bugs present in Firefox 77 Mozilla developers and community members reported memory safety bugs present in Firefox 77. 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 affects Firefox < 78.

CVE-2012-4217 [CRITICAL] CWE-416 CVE-2012-4217: Use-after-free vulnerability in the nsViewManager::ProcessPendingUpdates function in Mozilla Firefox Use-after-free vulnerability in the nsViewManager::ProcessPendingUpdates function in Mozilla Firefox before 17.0, Thunderbird before 17.0, and SeaMonkey before 2.14 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors.

CVE-2012-4213 [CRITICAL] CWE-416 CVE-2012-4213: Use-after-free vulnerability in the nsEditor::FindNextLeafNode function in Mozilla Firefox before 17 Use-after-free vulnerability in the nsEditor::FindNextLeafNode function in Mozilla Firefox before 17.0, Thunderbird before 17.0, and SeaMonkey before 2.14 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors.

CVE-2011-3660 [CRITICAL] CVE-2011-3660: Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox 4.x through 8.0, Thund Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox 4.x through 8.0, Thunderbird 5.0 through 8.0, and SeaMonkey before 2.6 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via vectors that trigger a compartment mismatch associated with the nsDOMMessageE

CVE-2011-2995 [CRITICAL] CVE-2011-2995: Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 3.6.23 and 4.x Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 3.6.23 and 4.x through 6, Thunderbird before 7.0, and SeaMonkey before 2.4 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown vectors.

CVE-2019-11760 [HIGH] CWE-787 CVE-2019-11760: A fixed-size stack buffer could overflow in nrappkit when doing WebRTC signaling. This resulted in a A fixed-size stack buffer could overflow in nrappkit when doing WebRTC signaling. This resulted in a potentially exploitable crash in some instances. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.

CVE-2020-12416 [HIGH] CVE-2020-12416: A VideoStreamEncoder may have been freed in a race condition with VideoBroadcaster::AddOrUpdateSink, resulting in a use-after-free, memory corruption, A VideoStreamEncoder may have been freed in a race condition with VideoBroadcaster::AddOrUpdateSink, resulting in a use-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 78.

CVE-2009-0352 [CRITICAL] CWE-399 CVE-2009-0352: Multiple unspecified vulnerabilities in Mozilla Firefox 3.x before 3.0.6, Thunderbird before 2.0.0.2 Multiple unspecified vulnerabilities in Mozilla Firefox 3.x before 3.0.6, Thunderbird before 2.0.0.21, and SeaMonkey before 1.1.15 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via vectors related to the layout engine and destruction of arbitrary layout objects by the

CVE-2021-29946 [HIGH] CWE-190 CVE-2021-29946: Ports that were written as an integer overflow above the bounds of a 16-bit integer could have bypas Ports that were written as an integer overflow above the bounds of a 16-bit integer could have bypassed port blocking restrictions when used in the Alt-Svc header. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.

CVE-2021-23954 [HIGH] CWE-843 CVE-2021-23954: Using the new logical assignment operators in a JavaScript switch statement could have caused a type Using the new logical assignment operators in a JavaScript switch statement could have caused a type confusion, leading to a memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.

CVE-2017-5412 [HIGH] CWE-119 CVE-2017-5412: A buffer overflow read during SVG filter color value operations, resulting in data exposure. This vu A buffer overflow read during SVG filter color value operations, resulting in data exposure. This vulnerability affects Firefox < 52 and Thunderbird < 52.