Mozilla Thunderbird vulnerabilities

CVE-2014-1493 [CRITICAL] CWE-119 CVE-2014-1493: Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 28.0, Firefox E Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and SeaMonkey before 2.25 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown vectors.

CVE-2013-5609 [CRITICAL] CVE-2013-5609: Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 26.0, Firefox E Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 26.0, Firefox ESR 24.x before 24.2, Thunderbird before 24.2, and SeaMonkey before 2.23 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown vectors.

CVE-2026-4718 [HIGH] CWE-758 CVE-2026-4718: Undefined behavior in the WebRTC: Signaling component. This vulnerability was fixed in Firefox 149, Undefined behavior in the WebRTC: Signaling component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

CVE-2025-13018 [HIGH] CVE-2025-13018: Mitigation bypass in the DOM: Security component Mitigation bypass in the DOM: Security component. This vulnerability affects Firefox < 145, Firefox ESR < 140.5, Thunderbird < 145, and Thunderbird < 140.5.

CVE-2019-9800 [CRITICAL] CWE-787 CVE-2019-9800: Mozilla developers and community members reported memory safety bugs present in Firefox 66, Firefox Mozilla developers and community members reported memory safety bugs present in Firefox 66, Firefox ESR 60.6, and Thunderbird 60.6. 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 Thunderbird < 60.7, Firefox < 67, and

CVE-2006-1735 [CRITICAL] CWE-264 CVE-2006-1735: Mozilla Firefox and Thunderbird 1.x before 1.5 and 1.0.x before 1.0.8, Mozilla Suite before 1.7.13, Mozilla Firefox and Thunderbird 1.x before 1.5 and 1.0.x before 1.0.8, Mozilla Suite before 1.7.13, and SeaMonkey before 1.0 allows remote attackers to execute arbitrary code by using an eval in an XBL method binding (XBL.method.eval) to create Javascript functions that are compiled with extra privileges.

CVE-2017-5403 [CRITICAL] CWE-416 CVE-2017-5403: When adding a range to an object in the DOM, it is possible to use "addRange" to add the range to an When adding a range to an object in the DOM, it is possible to use "addRange" to add the range to an incorrect root object. This triggers a use-after-free, resulting in a potentially exploitable crash. This vulnerability affects Firefox < 52 and Thunderbird < 52.

CVE-2019-11691 [CRITICAL] CWE-416 CVE-2019-11691: A use-after-free vulnerability can occur when working with XMLHttpRequest (XHR) in an event loop, ca A use-after-free vulnerability can occur when working with XMLHttpRequest (XHR) in an event loop, causing the XHR main thread to be called after it has been freed. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.

CVE-2018-18512 [CRITICAL] CWE-416 CVE-2018-18512: A use-after-free vulnerability can occur while playing a sound notification in Thunderbird. The memo A use-after-free vulnerability can occur while playing a sound notification in Thunderbird. The memory storing the sound data is immediately freed, although the sound is still being played asynchronously, leading to a potentially exploitable crash. This vulnerability affects Thunderbird < 60.5.

CVE-2025-59375 [HIGH] CVE-2025-59375: libexpat in Expat before 2 libexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing.

CVE-2015-4473 [CRITICAL] CVE-2015-4473: Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 40 Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 40.0 and Firefox ESR 38.x before 38.2 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown vectors.

CVE-2017-5444 [HIGH] CWE-119 CVE-2017-5444: A buffer overflow vulnerability while parsing "application/http-index-format" format content when th A buffer overflow vulnerability while parsing "application/http-index-format" format content when the header contains improperly formatted data. This allows for an out-of-bounds read of data from memory. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.

CVE-2021-4129 [CRITICAL] CWE-787 CVE-2021-4129: Mozilla developers and community members Julian Hector, Randell Jesup, Gabriele Svelto, Tyson Smith, Mozilla developers and community members Julian Hector, Randell Jesup, Gabriele Svelto, Tyson Smith, Christian Holler, and Masayuki Nakano reported memory safety bugs present in Firefox 94. 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. Thi

CVE-2022-29917 [CRITICAL] CWE-787 CVE-2022-29917: Mozilla developers Andrew McCreight, Gabriele Svelto, Tom Ritter and the Mozilla Fuzzing Team report Mozilla developers Andrew McCreight, Gabriele Svelto, Tom Ritter and the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 99 and Firefox ESR 91.8. 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 affect

CVE-2024-11704 [CRITICAL] CWE-415 CVE-2024-11704: A double-free issue could have occurred in `sec_pkcs7_decoder_start_decrypt()` when handling an erro A double-free issue could have occurred in `sec_pkcs7_decoder_start_decrypt()` when handling an error path. Under specific conditions, the same symmetric key could have been freed twice, potentially leading to memory corruption. This vulnerability affects Firefox < 133, Thunderbird < 133, Firefox ESR < 128.7, and Thunderbird < 128.7.

CVE-2024-6604 [HIGH] CWE-120 CVE-2024-6604: Memory safety bugs present in Firefox 127, Firefox ESR 115.12, and Thunderbird 115.12. Some of these Memory safety bugs present in Firefox 127, Firefox ESR 115.12, and Thunderbird 115.12. 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 < 128, Firefox ESR < 115.13, Thunderbird < 115.13, and Thunderbird < 128.

CVE-2025-1937 [HIGH] CWE-1260 CVE-2025-1937: Memory safety bugs present in Firefox 135, Thunderbird 135, Firefox ESR 115.20, Firefox ESR 128.7, a Memory safety bugs present in Firefox 135, Thunderbird 135, Firefox ESR 115.20, Firefox ESR 128.7, and Thunderbird 128.7. 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 136, Firefox ESR 115.21, Firefox E

CVE-2024-8900 [HIGH] CWE-732 CVE-2024-8900: An attacker could write data to the user's clipboard, bypassing the user prompt, during a certain se An attacker could write data to the user's clipboard, bypassing the user prompt, during a certain sequence of navigational events. This vulnerability affects Firefox < 129, Firefox ESR < 128.3, and Thunderbird < 128.3.

CVE-2016-9066 [HIGH] CWE-119 CVE-2016-9066: A buffer overflow resulting in a potentially exploitable crash due to memory allocation issues when A buffer overflow resulting in a potentially exploitable crash due to memory allocation issues when handling large amounts of incoming data. This vulnerability affects Thunderbird < 45.5, Firefox ESR < 45.5, and Firefox < 50.

CVE-2026-6784 [HIGH] CWE-125 CVE-2026-6784: Memory safety bugs present in Firefox 149 and Thunderbird 149. Some of these bugs showed evidence of Memory safety bugs present in Firefox 149 and Thunderbird 149. 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 and Thunderbird 150.