Mozilla Thunderbird vulnerabilities

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-2016-1521 [HIGH] CWE-119 CVE-2016-1521: The directrun function in directmachine.cpp in Libgraphite in Graphite 2 1.2.4, as used in Mozilla F The directrun function in directmachine.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 validate a certain skip operation, which allows remote attackers to execute arbitrary code, obtain sensitive information, or cause a denial of service (out-of-bounds read and application cras

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-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-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-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-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-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-2024-6604 [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-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-2026-84642 [HIGH] CWE-1333 CVE-2026-84642: The values of the mail.allowed_attachment_hostnames advanced config setting were used in a regular e The values of the mail.allowed_attachment_hostnames advanced config setting were used in a regular expression without escaping. For some possible valid hostnames, this could allow certain unintended hostnames to also match and serve remote attachments. This vulnerability was fixed in Thunderbird 155 and Thunderbird 153.2.

CVE-2026-6772 [HIGH] CWE-754 CVE-2026-6772: Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Fir Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

CVE-2014-1533 [CRITICAL] CVE-2014-1533: Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 30 Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 30.0, Firefox ESR 24.x before 24.6, and Thunderbird before 24.6 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown vectors.

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.

CVE-2026-7320 [HIGH] CWE-119 CVE-2026-7320: Information disclosure due to incorrect boundary conditions in the Audio/Video component. This vulne Information disclosure due to incorrect boundary conditions in the Audio/Video component. This vulnerability was fixed in Firefox 150.0.1, Firefox ESR 140.10.1, Firefox ESR 115.35.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.

CVE-2026-6766 [HIGH] CWE-754 CVE-2026-6766: Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Fir Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

CVE-2026-12314 [HIGH] CWE-119 CVE-2026-12314: Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

CVE-2026-12312 [HIGH] CWE-119 CVE-2026-12312: Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

CVE-2026-12310 [HIGH] CWE-119 CVE-2026-12310: Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.