Mozilla Thunderbird vulnerabilities

CVE-2019-9815 [HIGH] CWE-203 CVE-2019-9815: If hyperthreading is not disabled, a timing attack vulnerability exists, similar to previous Spectre If hyperthreading is not disabled, a timing attack vulnerability exists, similar to previous Spectre attacks. Apple has shipped macOS 10.14.5 with an option to disable hyperthreading in applications running untrusted code in a thread through a new sysctl. Firefox now makes use of it on the main thread and any worker threads. *Note: users need to update

CVE-2016-9898 [CRITICAL] CWE-416 CVE-2016-9898: Use-after-free resulting in potentially exploitable crash when manipulating DOM subtrees in the Edit Use-after-free resulting in potentially exploitable crash when manipulating DOM subtrees in the Editor. This vulnerability affects Firefox < 50.1, Firefox ESR < 45.6, and Thunderbird < 45.6.

CVE-2017-5429 [CRITICAL] CWE-119 CVE-2017-5429: Memory safety bugs were reported in Firefox 52, Firefox ESR 45.8, Firefox ESR 52, and Thunderbird 52 Memory safety bugs were reported in Firefox 52, Firefox ESR 45.8, Firefox ESR 52, and Thunderbird 52. 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 < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Fi

CVE-2018-12378 [CRITICAL] CWE-416 CVE-2018-12378: A use-after-free vulnerability can occur when an IndexedDB index is deleted while still in use by Ja A use-after-free vulnerability can occur when an IndexedDB index is deleted while still in use by JavaScript code that is providing payload values to be stored. This results in a potentially exploitable crash. This vulnerability affects Firefox < 62, Firefox ESR < 60.2, and Thunderbird < 60.2.1.

CVE-2018-12377 [CRITICAL] CWE-416 CVE-2018-12377: A use-after-free vulnerability can occur when refresh driver timers are refreshed in some circumstan A use-after-free vulnerability can occur when refresh driver timers are refreshed in some circumstances during shutdown when the timer is deleted while still in use. This results in a potentially exploitable crash. This vulnerability affects Firefox < 62, Firefox ESR < 60.2, and Thunderbird < 60.2.1.

CVE-2017-7792 [CRITICAL] CWE-119 CVE-2017-7792: A buffer overflow will occur when viewing a certificate in the certificate manager if the certificat A buffer overflow will occur when viewing a certificate in the certificate manager if the certificate has an extremely long object identifier (OID). This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

CVE-2010-1585 [CRITICAL] CWE-20 CVE-2010-1585: The nsIScriptableUnescapeHTML.parseFragment method in the ParanoidFragmentSink protection mechanism The nsIScriptableUnescapeHTML.parseFragment method in the ParanoidFragmentSink protection mechanism in Mozilla Firefox before 3.5.17 and 3.6.x before 3.6.14, Thunderbird before 3.1.8, and SeaMonkey before 2.0.12 does not properly sanitize HTML in a chrome document, which makes it easier for remote attackers to execute arbitrary JavaScript with chrome

CVE-2017-5380 [CRITICAL] CWE-416 CVE-2017-5380: A potential use-after-free found through fuzzing during DOM manipulation of SVG content. This vulner A potential use-after-free found through fuzzing during DOM manipulation of SVG content. This vulnerability affects Thunderbird < 45.7, Firefox ESR < 45.7, and Firefox < 51.

CVE-2012-3967 [CRITICAL] CWE-787 CVE-2012-3967: The WebGL implementation in Mozilla Firefox before 15.0, Firefox ESR 10.x before 10.0.7, Thunderbird 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 on Linux, when a large number of sampler uniforms are used, does not properly interact with Mesa drivers, which allows remote attackers to execute arbitrary code or cause a de

CVE-2018-5098 [CRITICAL] CWE-416 CVE-2018-5098: A use-after-free vulnerability can occur when form input elements, focus, and selections are manipul A use-after-free vulnerability can occur when form input elements, focus, and selections are manipulated by script content. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 52.6, Firefox ESR < 52.6, and Firefox < 58.

CVE-2006-1730 [CRITICAL] CWE-189 CVE-2006-1730: Integer overflow in Mozilla Firefox and Thunderbird 1.x before 1.5.0.2 and 1.0.x before 1.0.8, Mozil Integer overflow in Mozilla Firefox and Thunderbird 1.x before 1.5.0.2 and 1.0.x before 1.0.8, Mozilla Suite before 1.7.13, and SeaMonkey before 1.0.1 allows remote attackers to execute arbitrary code via a large number in the CSS letter-spacing property that leads to a heap-based buffer overflow.

CVE-2017-7800 [CRITICAL] CWE-416 CVE-2017-7800: A use-after-free vulnerability can occur in WebSockets when the object holding the connection is fre A use-after-free vulnerability can occur in WebSockets when the object holding the connection is freed before the disconnection operation is finished. This results in an exploitable crash. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

CVE-2017-7749 [CRITICAL] CWE-416 CVE-2017-7749: A use-after-free vulnerability when using an incorrect URL during the reloading of a docshell. This A use-after-free vulnerability when using an incorrect URL during the reloading of a docshell. This results in a potentially exploitable crash. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.

CVE-2013-0796 [CRITICAL] CVE-2013-0796: The WebGL subsystem in Mozilla Firefox before 20.0, Firefox ESR 17.x before 17.0.5, Thunderbird befo The WebGL subsystem in Mozilla Firefox before 20.0, Firefox ESR 17.x before 17.0.5, Thunderbird before 17.0.5, Thunderbird ESR 17.x before 17.0.5, and SeaMonkey before 2.17 on Linux does not properly interact with Mesa drivers, which allows remote attackers to execute arbitrary code or cause a denial of service (free of unallocated memory) via unspecified v

CVE-2020-12395 [CRITICAL] CWE-787 CVE-2020-12395: Mozilla developers and community members reported memory safety bugs present in Firefox 75 and Firef Mozilla developers and community members reported memory safety bugs present in Firefox 75 and Firefox ESR 68.7. 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 affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird <

CVE-2017-5425 [HIGH] CWE-200 CVE-2017-5425: The Gecko Media Plugin sandbox allows access to local files that match specific regular expressions. The Gecko Media Plugin sandbox allows access to local files that match specific regular expressions. On OS OX, this matching allows access to some data in subdirectories of "/private/var" that could expose personal or temporary data. This has been updated to not allow access to "/private/var" and its subdirectories. Note: this issue only affects OS X. O

CVE-2019-9788 [CRITICAL] CWE-787 CVE-2019-9788: Mozilla developers and community members reported memory safety bugs present in Firefox 65, Firefox Mozilla developers and community members reported memory safety bugs present in Firefox 65, Firefox ESR 60.5, and Thunderbird 60.5. 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 < 60.6, Firefox ESR < 60.

CVE-2026-0877 [HIGH] CWE-693 CVE-2026-0877: Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 147, Firef Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

CVE-2026-12290 [HIGH] CWE-119 CVE-2026-12290: Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140 Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

CVE-2026-8962 [HIGH] CWE-693 CVE-2026-8962: Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151, Firef Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.