Mozilla Firefox vulnerabilities

CVE-2026-2447 [HIGH] CWE-122 CVE-2026-2447: Heap buffer overflow in libvpx. This vulnerability was fixed in Firefox 147.0.4, Firefox ESR 140.7.1 Heap buffer overflow in libvpx. This vulnerability was fixed in Firefox 147.0.4, Firefox ESR 140.7.1, Firefox ESR 115.32.1, Thunderbird 140.7.2, and Thunderbird 147.0.2.

CVE-2026-2769 [HIGH] CWE-416 CVE-2026-2769: Use-after-free in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 148, Fir Use-after-free in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

CVE-2013-0754 [CRITICAL] CWE-416 CVE-2013-0754: Use-after-free vulnerability in the ListenerManager implementation in Mozilla Firefox before 18.0, F Use-after-free vulnerability in the ListenerManager implementation in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderbird ESR 10.x before 10.0.12 and 17.x before 17.0.2, and SeaMonkey before 2.15 allows remote attackers to execute arbitrary code via vectors involving the trigger

CVE-2010-2766 [CRITICAL] CWE-94 CVE-2010-2766: The normalizeDocument function in Mozilla Firefox before 3.5.12 and 3.6.x before 3.6.9, Thunderbird The normalizeDocument function in Mozilla Firefox before 3.5.12 and 3.6.x before 3.6.9, Thunderbird before 3.0.7 and 3.1.x before 3.1.3, and SeaMonkey before 2.0.7 does not properly handle the removal of DOM nodes during normalization, which might allow remote attackers to execute arbitrary code via vectors involving access to a deleted object.

CVE-2014-1543 [HIGH] CWE-119 CVE-2014-1543: Multiple heap-based buffer overflows in the navigator.getGamepads function in the Gamepad API in Moz Multiple heap-based buffer overflows in the navigator.getGamepads function in the Gamepad API in Mozilla Firefox before 30.0 allow remote attackers to execute arbitrary code by using non-contiguous axes with a (1) physical or (2) virtual Gamepad device.

CVE-2026-74969 [HIGH] CWE-416 CVE-2026-74969: Race condition, use-after-free in the Layout: Text and Fonts component. This vulnerability was fixed Race condition, use-after-free in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

CVE-2026-74949 [HIGH] CWE-416 CVE-2026-74949: Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 154, Fir Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

CVE-2026-3845 [HIGH] CWE-122 CVE-2026-3845: Heap buffer overflow in the Audio/Video: Playback component in Firefox for Android. This vulnerabili Heap buffer overflow in the Audio/Video: Playback component in Firefox for Android. This vulnerability was fixed in Firefox 148.0.2.

CVE-2026-74942 [HIGH] CWE-269 CVE-2026-74942: Privilege escalation in the Remote Settings Client component. This vulnerability was fixed in Firefo Privilege escalation in the Remote Settings Client component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

CVE-2026-84128 [HIGH] CWE-284 CVE-2026-84128: Privilege escalation in the WebDriver BiDi component. This vulnerability was fixed in Firefox 155 an Privilege escalation in the WebDriver BiDi component. This vulnerability was fixed in Firefox 155 and Thunderbird 155.

CVE-2026-84123 [HIGH] CWE-416 CVE-2026-84123: Privilege escalation due to use-after-free in the Graphics: WebGPU component. This vulnerability was Privilege escalation due to use-after-free in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.

CVE-2026-74950 [HIGH] CWE-269 CVE-2026-74950: Privilege escalation in the Downloads API component. This vulnerability was fixed in Firefox 154, Fi Privilege escalation in the Downloads API component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

CVE-2010-0176 [CRITICAL] CWE-399 CVE-2010-0176: Mozilla Firefox before 3.0.19, 3.5.x before 3.5.9, and 3.6.x before 3.6.2; Thunderbird before 3.0.4; Mozilla Firefox before 3.0.19, 3.5.x before 3.5.9, and 3.6.x before 3.6.2; Thunderbird before 3.0.4; and SeaMonkey before 2.0.4 do not properly manage reference counts for option elements in a XUL tree optgroup, which might allow remote attackers to execute arbitrary code via unspecified vectors that trigger access to deleted elements, related to a

CVE-2026-16366 [HIGH] CWE-269 CVE-2026-16366: Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 153 a Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

CVE-2025-8035 [HIGH] CWE-119 CVE-2025-8035: Memory safety bugs present in Firefox ESR 128.12, Thunderbird ESR 128.12, Firefox ESR 140.0, Thunder Memory safety bugs present in Firefox ESR 128.12, Thunderbird ESR 128.12, Firefox ESR 140.0, Thunderbird ESR 140.0, Firefox 140 and Thunderbird 140. 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 141, Fir

CVE-2026-12289 [HIGH] CWE-269 CVE-2026-12289: Privilege escalation in the Graphics: WebRender component. This vulnerability was fixed in Firefox 1 Privilege escalation in the Graphics: WebRender component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

CVE-2026-8957 [HIGH] CWE-269 CVE-2026-8957: Privilege escalation in the Enterprise Policies component. This vulnerability was fixed in Firefox 1 Privilege escalation in the Enterprise Policies component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

CVE-2016-9900 [HIGH] CWE-254 CVE-2016-9900: External resources that should be blocked when loaded by SVG images can bypass security restrictions External resources that should be blocked when loaded by SVG images can bypass security restrictions through the use of "data:" URLs. This could allow for cross-domain data leakage. This vulnerability affects Firefox < 50.1, Firefox ESR < 45.6, and Thunderbird < 45.6.

CVE-2026-109709 [HIGH] Mozilla Foundation Security Advisory 2026-106: CVE-2026-109709 Mozilla Foundation Security Advisory 2026-106 CVE: CVE-2026-109709 Product: Firefox Impact: low Fixed in: Firefox 158

CVE-2026-3847 [HIGH] CWE-119 CVE-2026-3847: Memory safety bugs present in Firefox 148.0.2. Some of these bugs showed evidence of memory corrupti Memory safety bugs present in Firefox 148.0.2. 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 was fixed in Firefox 148.0.2.