Firefox vulnerabilities
667 known CVE vulnerabilities in Firefox, translated and rated.
- CVE-2026-109756High
A privilege escalation vulnerability in the DOM: Navigation component. It was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109754High
A vulnerability in the DOM: Editor component is due to incorrect boundary conditions. It was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109753High
A vulnerability in the Layout component is due to incorrect boundary conditions. It was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109752Medium
Use-after-free vulnerability in the DOM: Workers component of Firefox and Thunderbird. The flaw was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109751Medium
Information disclosure vulnerability in the Networking component of Firefox and Thunderbird. The flaw was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109749Medium
Use-after-free vulnerability in the JavaScript: WebAssembly component of Firefox and Thunderbird. The flaw was fixed in Firefox 158 and Thunderbird 158.
- CVE-2026-109748Medium
Use-after-free vulnerability in the JavaScript: WebAssembly component of Firefox and Thunderbird. The flaw was fixed in Firefox 158 and Thunderbird 158.
- CVE-2026-109747High
Other issue in the Address Bar component. It was fixed in Firefox 158 and Thunderbird 158.
- CVE-2026-109746High
Mitigation bypass in the DOM: Security component. It was fixed in Firefox 158 and Thunderbird 158.
- CVE-2026-109744High
Other issue in the DOM: File component. It was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109743High
Privilege escalation vulnerability in the Panning and Zooming component. The flaw was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109742Medium
Information disclosure vulnerability in the PDF Viewer component of Firefox and Thunderbird. The flaw was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109741Medium
Use-after-free vulnerability in the Storage: Bucket File System component of Firefox and Thunderbird. The flaw was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109739High
Privilege escalation vulnerability in the WebExtensions component. The flaw was fixed in Firefox 158 and Thunderbird 158.
- CVE-2026-109738Medium
Use-after-free vulnerability in the Audio/Video: Playback component of Firefox and Thunderbird. The flaw was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109737High
Mitigation bypass in the Enterprise Policies component. The flaw was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109736High
Frame poisoning vulnerability in the Layout component. The flaw was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109735Medium
Use-after-free vulnerability in the DOM: Animation component of Firefox and Thunderbird. Fixed in version 158.
- CVE-2026-109734High
Mitigation bypass in the DOM: Security component. The flaw was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109733High
JIT miscompilation in the JavaScript Engine: JIT component. The flaw was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109732Medium
Use-after-free vulnerability in the DOM: Streams component of Firefox and Thunderbird. Fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109731Medium
Incorrect boundary conditions in the Graphics: Canvas2D component. The flaw was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109730High
Integer overflow in the Graphics component. The flaw was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109729Medium
Use-after-free vulnerability in the JavaScript Engine: JIT component of Firefox and Thunderbird. Fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109728Medium
Use-after-free vulnerability in the DOM: Animation component of Firefox and Thunderbird. Fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109727Medium
Use-after-free vulnerability in the Audio/Video component of Firefox and Thunderbird. Fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109726Medium
Use-after-free vulnerability in the SVG component of Firefox and Thunderbird. Fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109725Medium
Use-after-free vulnerability in the DOM: Core & HTML component of Firefox and Thunderbird. Fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109724Medium
Use-after-free vulnerability in the DOM: Core & HTML component of Firefox and Thunderbird. Fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109723Medium
Integer overflow in the Layout: Text and Fonts component. The flaw was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109722High
JIT miscompilation in the JavaScript Engine causes incorrect code execution. The vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, and Thunderbird 158 and 153.5.
- CVE-2026-109721Medium
Incorrect boundary conditions in the JavaScript Engine: JIT component. The vulnerability was fixed in Firefox 158, Firefox ESR 153.5, and Thunderbird 158 and 153.5.
- CVE-2026-109720High
JIT miscompilation in the JavaScript: WebAssembly component. The vulnerability was fixed in Firefox 158, Firefox ESR 153.5, and Thunderbird 158 and 153.5.
- CVE-2026-109719Medium
Race condition and use-after-free vulnerability in the Graphics: CanvasWebGL component of Firefox and Thunderbird. Fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109718Medium
Use-after-free vulnerability in the XML component of Firefox and Thunderbird. Fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109717Medium
Use-after-free vulnerability in the DOM: Bindings (WebIDL) component of Firefox and Thunderbird. It can lead to arbitrary code execution or application crash. The issue was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109716High
Incorrect boundary conditions in the JavaScript Engine component. The vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, and Thunderbird 158 and 153.5.
- CVE-2026-109715High
Incorrect boundary conditions in the JavaScript Engine component. The vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, and Thunderbird 158 and 153.5.
- CVE-2026-109714Medium
Incorrect boundary conditions in the Layout component. The vulnerability was fixed in Firefox 158 and Thunderbird 158.
- CVE-2026-109713Medium
Use-after-free vulnerability in the Crash Reporting component of Firefox and Thunderbird. It can lead to arbitrary code execution or application crash. The issue was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109712High
Sandbox escape due to uninitialized memory in the Graphics component. The vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, and Thunderbird 158 and 153.5.
- CVE-2026-109711Medium
Use-after-free vulnerability in the Graphics: Canvas2D component of Firefox and Thunderbird. It can lead to arbitrary code execution or application crash. The issue was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109710Medium
Use-after-free vulnerability in the Graphics: Text component of Firefox and Thunderbird. It can lead to arbitrary code execution or application crash. The issue was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109709High
An information disclosure and privilege escalation vulnerability in the Security: Process Sandboxing component. It was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109706Medium
Use-after-free vulnerability in the Storage: IndexedDB component of Firefox and Thunderbird. It can lead to arbitrary code execution or application crash. The issue was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
- CVE-2026-109704High
Privilege escalation in the Application Update component. The vulnerability was fixed in Firefox 158, Firefox ESR 153.5, and Thunderbird 158 and 153.5.
- CVE-2026-96869Medium
An information disclosure vulnerability was found in the Networking component of Mozilla products. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.
- CVE-2026-100832High
Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 140.17, Thunderbird 153.4, Firefox ESR 115.42, and Firefox ESR 140.17.
- CVE-2026-100831High
Use-after-free in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
- CVE-2026-100830High
Mitigation bypass in the DOM: Navigation component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

