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Medium 5.4
Incorrect boundary conditions in the Layout component
Incorrect boundary conditions in the Layout component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.
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Medium 5.4CVE-2026-109721 Public exploit
Incorrect boundary conditions in the JavaScript Engine: JIT component
Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
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Medium 5.4
Use-after-free in the DOM: Bindings (WebIDL) component
Use-after-free in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
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Medium 5.4
Use-after-free in the Crash Reporting component
Use-after-free in the Crash Reporting component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
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Medium 5.4
Use-after-free in the Graphics: Canvas2D component
Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
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Medium 5.4
Use-after-free in the Audio/Video component
Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
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Medium 5.4
Use-after-free in the JavaScript Engine: JIT component
Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
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Medium 5.4
Use-after-free in the DOM: Animation component
Use-after-free in the DOM: Animation component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
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Medium 5.4
Use-after-free in the DOM: Streams component
Use-after-free in the DOM: Streams component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
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Medium 4.2
Race condition, use-after-free in the Graphics: CanvasWebGL component
Race condition, use-after-free in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
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Medium 5.4
Use-after-free in the SVG component
Use-after-free in the SVG component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
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Medium 5.4
Use-after-free in the DOM: Core & HTML component
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
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Medium 5.4
Use-after-free in the XML component
Use-after-free in the XML component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
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Medium 5.4
Use-after-free in the Storage: IndexedDB component
Use-after-free in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
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Medium 5.4
Use-after-free in the Graphics: Text component
Use-after-free in the Graphics: Text component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
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Medium 6.3
Heap buffer overflow opening large email
An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size. This vulnerability was fixed in Thunderbird 157, Thunderbird 140.17, and Thunderbird 153.4.
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Medium 6.5
Denial-of-service in the Storage: StorageManager component
Denial-of-service in the Storage: StorageManager component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
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Medium 4.7
Site isolation issue in the Panning and Zooming component
Site isolation issue in the Panning and Zooming component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
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Medium 5.4
Spoofing issue in the Networking: HTTP component
Spoofing issue in the Networking: HTTP component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
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Medium 5.4
Other issue in the JavaScript: WebAssembly component
Other issue in the JavaScript: WebAssembly component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
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Medium 6.5
Denial-of-service in the Graphics component
Denial-of-service in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
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Medium 4.3
Uninitialized memory in the Graphics: WebGPU component
Uninitialized memory in the Graphics: WebGPU component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
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Medium 4.3
Uninitialized memory in the Graphics: WebGPU component
Uninitialized memory in the Graphics: WebGPU component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
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Medium 4.3
Uninitialized memory in the Graphics: WebGPU component
Uninitialized memory in the Graphics: WebGPU component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
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Medium 6.5
Denial-of-service in the Networking component
Denial-of-service in the Networking component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
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Medium 4.3
Information disclosure in the Networking component
Information disclosure in the Networking component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.
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Medium 6.5
JIT miscompilation in the JavaScript Engine component
JIT miscompilation in the JavaScript Engine component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
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Medium 4.3
Uninitialized memory in the Audio/Video component
Uninitialized memory in the Audio/Video component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
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Medium 4.3
Information disclosure in the Networking: JAR component
Information disclosure in the Networking: JAR component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
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Medium 6.5
Denial-of-service in the Security component
Denial-of-service in the Security component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.
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Medium 6.5
Denial-of-service in the SVG component
Denial-of-service in the SVG component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.
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Medium 4.3
Information disclosure in the Networking component
Information disclosure in the Networking component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.
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Medium 5.4
Spoofing issue in the DOM: Navigation component
Spoofing issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.
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Medium 5.4
Site isolation issue in the Reader Mode component
Site isolation issue in the Reader Mode component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.
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Medium 6.5
Denial-of-service in the Audio/Video component
Denial-of-service in the Audio/Video component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.
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Medium 6.3
Mitigation bypass in the DOM: Notifications component
Mitigation bypass in the DOM: Notifications component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.
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Medium 6.5
Information disclosure in the Graphics: ImageLib component
Information disclosure in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
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Medium 5.4
Mitigation bypass in the DOM: Copy & Paste and Drag & Drop component
Mitigation bypass in the DOM: Copy & Paste and Drag & Drop component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
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Medium 5.3
Use-after-free in the Audio/Video: Web Codecs component
Use-after-free in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
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Medium 4.3
Incorrect boundary conditions in the Layout: Grid component
Incorrect boundary conditions in the Layout: Grid component. This vulnerability was fixed in Firefox 155 and Thunderbird 155.