Mozilla Firefox Esr vulnerabilities

CVE-2026-109783 Mozilla Foundation Security Advisory 2026-108: CVE-2026-109783 Mozilla Foundation Security Advisory 2026-108 CVE: CVE-2026-109783 Product: Firefox ESR Impact: low Fixed in: Firefox ESR 153.5

CVE-2019-11752 [HIGH] CWE-416 CVE-2019-11752: It is possible to delete an IndexedDB key value and subsequently try to extract it during conversion It is possible to delete an IndexedDB key value and subsequently try to extract it during conversion. This results in a use-after-free and a potentially exploitable crash. This vulnerability affects Firefox < 69, Thunderbird < 68.1, Thunderbird < 60.9, Firefox ESR < 60.9, and Firefox ESR < 68.1.

CVE-2019-17012 [HIGH] CWE-787 CVE-2019-17012: Mozilla developers reported memory safety bugs present in Firefox 70 and Firefox ESR 68.2. Some of t Mozilla developers reported memory safety bugs present in Firefox 70 and Firefox ESR 68.2. 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 Thunderbird < 68.3, Firefox ESR < 68.3, and Firefox < 71.

CVE-2017-7752 [HIGH] CWE-416 CVE-2017-7752: A use-after-free vulnerability during specific user interactions with the input method editor (IME) A use-after-free vulnerability during specific user interactions with the input method editor (IME) in some languages due to how events are handled. This results in a potentially exploitable crash but would require specific user interaction to trigger. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.

CVE-2020-12420 [HIGH] CWE-362 CVE-2020-12420: When trying to connect to a STUN server, a race condition could have caused a use-after-free of a po When trying to connect to a STUN server, a race condition could have caused a use-after-free of a pointer, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.10, Firefox < 78, and Thunderbird < 68.10.0.

CVE-2021-29980 [HIGH] CWE-909 CVE-2021-29980: Uninitialized memory in a canvas object could have caused an incorrect free() leading to memory corr Uninitialized memory in a canvas object could have caused an incorrect free() leading to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.

CVE-2019-11757 [HIGH] CWE-416 CVE-2019-11757: When following the value's prototype chain, it was possible to retain a reference to a locale, delet When following the value's prototype chain, it was possible to retain a reference to a locale, delete it, and subsequently reference it. This resulted in a use-after-free and a potentially exploitable crash. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.

CVE-2019-11758 [HIGH] CWE-787 CVE-2019-11758: Mozilla community member Philipp reported a memory safety bug present in Firefox 68 when 360 Total S Mozilla community member Philipp reported a memory safety bug present in Firefox 68 when 360 Total Security was installed. This bug showed evidence of memory corruption in the accessibility engine and we presume that with enough effort that it could be exploited to run arbitrary code. This vulnerability affects Firefox < 69, Thunderbird < 68.2, and Fi

CVE-2019-11751 [HIGH] CWE-88 CVE-2019-11751: Logging-related command line parameters are not properly sanitized when Firefox is launched by anoth Logging-related command line parameters are not properly sanitized when Firefox is launched by another program, such as when a user clicks on malicious links in a chat application. This can be used to write a log file to an arbitrary location such as the Windows 'Startup' folder. *Note: this issue only affects Firefox on Windows operating systems.*. Th

CVE-2023-25732 [HIGH] CWE-787 CVE-2023-25732: When encoding data from an <code>inputStream</code> in <code>xpcom</code> the size of the input bein When encoding data from an inputStream in xpcom the size of the input being encoded was not correctly calculated potentially leading to an out of bounds memory write. This vulnerability affects Firefox < 110, Thunderbird < 102.8, and Firefox ESR < 102.8.

CVE-2023-29539 [HIGH] CWE-476 CVE-2023-29539: When handling the filename directive in the Content-Disposition header, the filename would be trunca When handling the filename directive in the Content-Disposition header, the filename would be truncated if the filename contained a NULL character. This could have led to reflected file download attacks potentially tricking users to install malware. This vulnerability affects Firefox < 112, Focus for Android < 112, Firefox ESR < 102.10, Firefox for An

CVE-2022-31740 [HIGH] CWE-119 CVE-2022-31740: On arm64, WASM code could have resulted in incorrect assembly generation leading to a register alloc On arm64, WASM code could have resulted in incorrect assembly generation leading to a register allocation problem, and a potentially exploitable crash. This vulnerability affects Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10.

CVE-2018-12393 [HIGH] CWE-190 CVE-2018-12393: A potential vulnerability was found in 32-bit builds where an integer overflow during the conversion A potential vulnerability was found in 32-bit builds where an integer overflow during the conversion of scripts to an internal UTF-16 representation could result in allocating a buffer too small for the conversion. This leads to a possible out-of-bounds write. *Note: 64-bit builds are not vulnerable to this issue.*. This vulnerability affects Firefox

CVE-2023-25746 [HIGH] CWE-787 CVE-2023-25746: Memory safety bugs present in Firefox ESR 102.7. Some of these bugs showed evidence of memory corrup Memory safety bugs present in Firefox ESR 102.7. 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 Thunderbird < 102.8 and Firefox ESR < 102.8.

CVE-2017-5396 [CRITICAL] CWE-416 CVE-2017-5396: A use-after-free vulnerability in the Media Decoder when working with media files when some events a A use-after-free vulnerability in the Media Decoder when working with media files when some events are fired after the media elements are freed from memory. This vulnerability affects Thunderbird < 45.7, Firefox ESR < 45.7, and Firefox < 51.

CVE-2015-0818 [HIGH] CWE-264 CVE-2015-0818: Mozilla Firefox before 36.0.4, Firefox ESR 31.x before 31.5.3, and SeaMonkey before 2.33.1 allow rem Mozilla Firefox before 36.0.4, Firefox ESR 31.x before 31.5.3, and SeaMonkey before 2.33.1 allow remote attackers to bypass the Same Origin Policy and execute arbitrary JavaScript code with chrome privileges via vectors involving SVG hash navigation.

CVE-2017-5373 [CRITICAL] CWE-119 CVE-2017-5373: Memory safety bugs were reported in Firefox 50.1 and Firefox ESR 45.6. Some of these bugs showed evi Memory safety bugs were reported in Firefox 50.1 and Firefox ESR 45.6. 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 < 45.7, Firefox ESR < 45.7, and Firefox < 51.

CVE-2018-12390 [CRITICAL] CWE-119 CVE-2018-12390: Mozilla developers and community members reported memory safety bugs present in Firefox 62 and Firef Mozilla developers and community members reported memory safety bugs present in Firefox 62 and Firefox ESR 60.2. 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 < 63, Firefox ESR < 60.3, and Thunderbird < 6

CVE-2018-12405 [CRITICAL] CWE-119 CVE-2018-12405: Mozilla developers and community members reported memory safety bugs present in Firefox 63 and Firef Mozilla developers and community members reported memory safety bugs present in Firefox 63 and Firefox ESR 60.3. 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 < 60.4, Firefox ESR < 60.4, and Firefox <

CVE-2018-12376 [CRITICAL] CWE-119 CVE-2018-12376: Memory safety bugs present in Firefox 61 and Firefox ESR 60.1. Some of these bugs showed evidence of Memory safety bugs present in Firefox 61 and Firefox ESR 60.1. 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 < 62, Firefox ESR < 60.2, and Thunderbird < 60.2.1.