Firefox vulnerabilities
667 known CVE vulnerabilities in Firefox, translated and rated.
- CVE-2026-12296Critical
A sandbox escape vulnerability in the Security: Process Sandboxing component. The flaw was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.
- CVE-2026-12295Critical
A sandbox escape vulnerability exists in the DOM: Navigation component of Firefox and Thunderbird. The flaw was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
- CVE-2026-12294Critical
A sandbox escape vulnerability exists in the DOM: Workers component of Firefox and Thunderbird. The flaw was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
- CVE-2026-8948Critical
A vulnerability in the Networking component of Firefox and Thunderbird allows bypassing the same-origin policy (SOP) in the DOM. The flaw was fixed in version 151 of both products.
- CVE-2026-8401Critical
A sandbox escape vulnerability exists in the Profile Backup component of Firefox and Thunderbird. This flaw was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
- CVE-2026-8091Critical
Incorrect boundary conditions in the Audio/Video: Playback component in Firefox. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.
- CVE-2026-6748Critical
Uninitialized memory vulnerability in the Audio/Video: Web Codecs component of Firefox and Thunderbird. The flaw was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
- CVE-2026-5735Critical
Memory safety bugs were found in Firefox 149.0.1 and Thunderbird 149.0.1. Some of these bugs showed evidence of memory corruption and could potentially be exploited to run arbitrary code. The vulnerability was fixed in versions 149.0.2.
- CVE-2026-5734Critical
Memory safety bugs exist in Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1. Some of these bugs showed evidence of memory corruption and could potentially be exploited to run arbitrary code.
- CVE-2026-5731Critical
Memory safety bugs were found in Firefox ESR 115.34.0, Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1, and Thunderbird 149.0.1. Some of these bugs showed evidence of memory corruption and could potentially be exploited to run arbitrary code. The vulnerability was fixed in Firefox 149.0.2, Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.
- CVE-2026-4721Critical
Memory safety bugs were found in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148, and Thunderbird 148. Some of these bugs showed evidence of memory corruption and could potentially be exploited to run arbitrary code.
- CVE-2026-4700Critical
A mitigation bypass vulnerability exists in the Networking: HTTP component of Firefox and Thunderbird. The flaw was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
- CVE-2026-4698Critical
A JIT miscompilation vulnerability was found in the JavaScript Engine of Firefox and Thunderbird. It was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
- CVE-2026-4696Critical
A use-after-free vulnerability was found in the Layout: Text and Fonts component. This flaw was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
- CVE-2026-4692Critical
A sandbox escape vulnerability exists in the Responsive Design Mode component. This flaw was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
- CVE-2026-4691Critical
Use-after-free vulnerability in the CSS Parsing and Computation component of Firefox and Thunderbird. The flaw was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
- CVE-2026-4688Critical
A sandbox escape vulnerability due to a use-after-free bug in the Disability Access APIs component. The flaw was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
- CVE-2026-2799Critical
A use-after-free vulnerability was found in the DOM: Core & HTML component of Firefox and Thunderbird. The flaw was fixed in version 148 of both applications.
- CVE-2026-2797Critical
A use-after-free vulnerability was found in the JavaScript: GC component of Firefox and Thunderbird. This flaw was fixed in versions 148 of both products.
- CVE-2026-2796Critical
A JIT miscompilation vulnerability exists in the JavaScript: WebAssembly component of Firefox and Thunderbird. This flaw was fixed in versions 148 of both products.
- CVE-2026-2795Critical
A use-after-free vulnerability was found in the JavaScript: GC component of Firefox and Thunderbird. This flaw was fixed in versions 148 of both applications.
- CVE-2026-2793Critical
Memory safety bugs were found in Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147, and Thunderbird 147. Some of these bugs caused memory corruption, which could potentially allow arbitrary code execution.
- CVE-2026-2778Critical
A sandbox escape vulnerability due to incorrect boundary conditions in the DOM: Core & HTML component. This flaw was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
- CVE-2026-2776Critical
A sandbox escape vulnerability exists in the Telemetry component of external software due to incorrect boundary conditions. This flaw has been fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
- CVE-2026-2775Critical
A mitigation bypass vulnerability exists in the DOM: HTML Parser component of Firefox and Thunderbird. The flaw was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
- CVE-2026-2774Critical
An integer overflow was found in the Audio/Video component of Firefox and Thunderbird. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
- CVE-2026-2772Critical
Use-after-free vulnerability in the Audio/Video: Playback component of Firefox and Thunderbird. Fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
- CVE-2026-2771Critical
Undefined behavior was discovered in the DOM: Core & HTML component of Firefox and Thunderbird. The vulnerability has been fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
- CVE-2026-2770Critical
Use-after-free vulnerability in the DOM: Bindings (WebIDL) component. Fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
- CVE-2026-2768Critical
A sandbox escape vulnerability exists in the Storage: IndexedDB component. This flaw was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
- CVE-2026-2767Critical
A use-after-free vulnerability was found in the JavaScript: WebAssembly component, fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
- CVE-2026-2766Critical
A use-after-free vulnerability was found in the JavaScript Engine: JIT component. The flaw was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
- CVE-2026-2765Critical
A use-after-free vulnerability was found in the JavaScript Engine component of Firefox and Thunderbird. It was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
- CVE-2026-2764Critical
A vulnerability in the JavaScript engine's JIT component causes a miscompilation and use-after-free issue. It was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
- CVE-2026-2759Critical
A vulnerability in the Graphics: ImageLib component of Firefox and Thunderbird is caused by incorrect boundary conditions. This flaw may lead to unexpected behavior when processing images.
- CVE-2026-2758Critical
A use-after-free vulnerability was found in the JavaScript: GC component of Firefox and Thunderbird. It was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
- CVE-2026-0879Critical
A sandbox escape vulnerability exists in the Graphics component of Firefox and Thunderbird due to incorrect boundary conditions. The flaw is fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.
- CVE-2025-0244Medium
When redirecting to an invalid protocol scheme, an attacker could spoof the address bar. *Note: This issue only affected Android operating systems. Other operating systems are unaffected.*. This vulnerability was fixed in Firefox 134.
- CVE-2025-0242Medium
Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 115.18, Firefox ESR 128.5, Thunderbird 115.18, and Thunderbird 128.5. 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 134, Firefox ESR 128.6, Firefox ESR 115.19, Thunderbird 134, and Thunderbird 128.6.
- CVE-2024-9680CriticalActively exploited
An attacker was able to achieve code execution in the content process by exploiting a use-after-free in Animation timelines. We have had reports of this vulnerability being exploited in the wild. This vulnerability affects Firefox < 131.0.2, Firefox ESR < 128.3.1, Firefox ESR < 115.16.1, Thunderbird < 131.0.1, Thunderbird < 128.3.1, and Thunderbird < 115.16.0.
- CVE-2023-4058Critical
Memory safety bugs present in Firefox 115. 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.
- CVE-2023-34417Critical
Memory safety bugs present in Firefox 113. 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.
- CVE-2023-29531Critical
An attacker could have caused an out-of-bounds memory access using WebGL APIs, leading to memory corruption and a potentially exploitable crash. This bug only affects Firefox and Thunderbird for macOS; other operating systems are unaffected. It affects Firefox < 112, Firefox ESR < 102.10, and Thunderbird < 102.10.
- CVE-2019-17026HighActively exploited
Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type confusion. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Firefox ESR < 68.4.1, Thunderbird < 68.4.1, and Firefox < 72.0.1.
- CVE-2019-11707HighActively exploited
A type confusion vulnerability in the JavaScript engine of Firefox and Thunderbird, caused by issues with Array.pop, can lead to an exploitable crash. Targeted attacks in the wild are known.
- CVE-2016-9079HighActively exploited
A use-after-free vulnerability in SVG Animation has been discovered. An exploit built on this vulnerability has been discovered in the wild targeting Firefox and Tor Browser users on Windows. This vulnerability affects Firefox < 50.0.2, Firefox ESR < 45.5.1, and Thunderbird < 45.5.1.
- CVE-2016-9063Critical
An integer overflow during the parsing of XML using the Expat library. This vulnerability affects Firefox < 50.
- CVE-2026-118026Low risk· EPSS 4%
Invalid pointer in the JavaScript: GC component. This vulnerability was fixed in Firefox 159 and Thunderbird 159.
- CVE-2026-118025Low risk· EPSS 4%
Other issue in the SVG component. This vulnerability was fixed in Firefox 159 and Thunderbird 159.
- CVE-2026-118024Low risk· EPSS 4%
Use-after-free vulnerability in the Graphics: Text component of Firefox and Thunderbird. The issue was fixed in Firefox 159 and Thunderbird 159.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

