Mozilla Thunderbird vulnerabilities

CVE-2026-7323 [HIGH] CWE-119 CVE-2026-7323: Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. Some of these bugs s Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. 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 150.0.1, Firefox ESR 140.10.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.

CVE-2026-7322 [HIGH] CWE-119 CVE-2026-7322: Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. Some of these bugs s Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. 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 150.0.1, Firefox ESR 140.10.1, Firefox ESR 115.35.1, Thunderbird 150.0.1, and

CVE-2026-7324 [HIGH] CWE-119 CVE-2026-7324: Memory safety bugs present in Thunderbird 150.0.0. Some of these bugs showed evidence of memory corr Memory safety bugs present in Thunderbird 150.0.0. 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 150.0.1 and Thunderbird 150.0.1.

CVE-2016-1930 [CRITICAL] CVE-2016-1930: Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 44 Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 44.0 and Firefox ESR 38.x before 38.6 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown vectors.

CVE-2020-15659 [HIGH] CWE-787 CVE-2020-15659: Mozilla developers and community members reported memory safety bugs present in Firefox 78 and Firef Mozilla developers and community members reported memory safety bugs present in Firefox 78 and Firefox ESR 78.0. 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 < 79, Firefox ESR < 68.11, Firefox ESR < 78.1,

CVE-2026-109762 Mozilla Foundation Security Advisory 2026-110: CVE-2026-109762 Mozilla Foundation Security Advisory 2026-110 CVE: CVE-2026-109762 Product: Thunderbird Impact: low Fixed in: Thunderbird 153.5

CVE-2026-109745 Mozilla Foundation Security Advisory 2026-110: CVE-2026-109745 Mozilla Foundation Security Advisory 2026-110 CVE: CVE-2026-109745 Product: Thunderbird Impact: low Fixed in: Thunderbird 153.5

CVE-2013-5602 [CRITICAL] CWE-119 CVE-2013-5602: The Worker::SetEventListener function in the Web workers implementation in Mozilla Firefox before 25 The Worker::SetEventListener function in the Web workers implementation in Mozilla Firefox before 25.0, Firefox ESR 17.x before 17.0.10 and 24.x before 24.1, Thunderbird before 24.1, Thunderbird ESR 17.x before 17.0.10, and SeaMonkey before 2.22 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via ve

CVE-2006-1726 [CRITICAL] CWE-264 CVE-2006-1726: Unspecified vulnerability in Firefox and Thunderbird 1.5 before 1.5.0.2, and SeaMonkey before 1.0.1, Unspecified vulnerability in Firefox and Thunderbird 1.5 before 1.5.0.2, and SeaMonkey before 1.0.1, allows remote attackers to bypass the js_ValueToFunctionObject check and execute arbitrary code via unknown vectors involving setTimeout and Firefox' ForEach method.

CVE-2018-12391 [HIGH] CWE-863 CVE-2018-12391: During HTTP Live Stream playback on Firefox for Android, audio data can be accessed across origins i During HTTP Live Stream playback on Firefox for Android, audio data can be accessed across origins in violation of security policies. Because the problem is in the underlying Android service, this issue is addressed by treating all HLS streams as cross-origin and opaque to access. *Note: this issue only affects Firefox for Android. Desktop versions of

CVE-2007-0776 [CRITICAL] CWE-119 CVE-2007-0776: Heap-based buffer overflow in the _cairo_pen_init function in Mozilla Firefox 2.x before 2.0.0.2, Th Heap-based buffer overflow in the _cairo_pen_init function in Mozilla Firefox 2.x before 2.0.0.2, Thunderbird before 1.5.0.10, and SeaMonkey before 1.0.8 allows remote attackers to execute arbitrary code via a large stroke-width attribute in the clipPath element in an SVG file.

CVE-2020-15673 [HIGH] CWE-416 CVE-2020-15673: Mozilla developers reported memory safety bugs present in Firefox 80 and Firefox ESR 78.2. Some of t Mozilla developers reported memory safety bugs present in Firefox 80 and Firefox ESR 78.2. 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 < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.

CVE-2014-1550 [CRITICAL] CVE-2014-1550: Use-after-free vulnerability in the MediaInputPort class in Mozilla Firefox before 31.0 and Thunderb Use-after-free vulnerability in the MediaInputPort class in Mozilla Firefox before 31.0 and Thunderbird before 31.0 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) by leveraging incorrect Web Audio control-message ordering.

CVE-2019-17008 [HIGH] CWE-416 CVE-2019-17008: When using nested workers, a use-after-free could occur during worker destruction. This resulted in When using nested workers, a use-after-free could occur during worker destruction. This resulted in a potentially exploitable crash. This vulnerability affects Thunderbird < 68.3, Firefox ESR < 68.3, and Firefox < 71.

CVE-2014-1576 [HIGH] CWE-119 CVE-2014-1576: Heap-based buffer overflow in the nsTransformedTextRun function in Mozilla Firefox before 33.0, Fire Heap-based buffer overflow in the nsTransformedTextRun function in Mozilla Firefox before 33.0, Firefox ESR 31.x before 31.2, and Thunderbird 31.x before 31.2 allows remote attackers to execute arbitrary code via Cascading Style Sheets (CSS) token sequences that trigger changes to capitalization style.

CVE-2021-38496 [HIGH] CWE-416 CVE-2021-38496: During operations on MessageTasks, a task may have been removed while it was still scheduled, result During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.

CVE-2019-11740 [HIGH] CWE-787 CVE-2019-11740: Mozilla developers and community members reported memory safety bugs present in Firefox 68, Firefox Mozilla developers and community members reported memory safety bugs present in Firefox 68, Firefox ESR 68, and Firefox 60.8. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 69, Thunderbird < 68.1, Thunderbird

CVE-2020-15656 [HIGH] CWE-843 CVE-2020-15656: JIT optimizations involving the Javascript arguments object could confuse later optimizations. This JIT optimizations involving the Javascript arguments object could confuse later optimizations. This risk was already mitigated by various precautions in the code, resulting in this bug rated at only moderate severity. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.

CVE-2020-6805 [HIGH] CWE-416 CVE-2020-6805: When removing data about an origin whose tab was recently closed, a use-after-free could occur in th When removing data about an origin whose tab was recently closed, a use-after-free could occur in the Quota manager, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6.

CVE-2021-23999 [HIGH] CWE-269 CVE-2021-23999: If a Blob URL was loaded through some unusual user interaction, it could have been loaded by the Sys If a Blob URL was loaded through some unusual user interaction, it could have been loaded by the System Principal and granted additional privileges that should not be granted to web content. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.