Mozilla Firefox (en-US) 150.0
Mozilla Firefox (en-US) 150.0, released April 21, 2026, fixes 42 CVEs in Mozilla Firefox (en-US). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Firefox (en-US) is 159.0, which also fixes every one of these CVEs.
Superseded. The latest Mozilla Firefox (en-US) is 159.0, which also fixes every CVE on this page. Install that instead.
Priority of the 42 CVEs
Applies to
| Product | Version |
|---|---|
| Mozilla Firefox (en-US) | 150.0 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| Urgent | CVE-2026-6768 | Mitigation bypass in the Networking: Cookies component | 9.8 | 0.0029 | None reported |
| Urgent | CVE-2026-6760 | Mitigation bypass in the Networking: Cookies component | 9.8 | 0.0028 | None reported |
| High | CVE-2026-6770 | Other issue in the Storage: IndexedDB component | 8.8 | 0.0388 | None reported |
| High | CVE-2026-6746 | Use-after-free in the DOM: Core & HTML component | 8.8 | 0.0095 | None reported |
| High | CVE-2026-6758 | Use-after-free in the JavaScript: WebAssembly component | 7.5 | 0.0081 | None reported |
| High | CVE-2026-6785 | Memory safety bugs fixed in Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150 | 8.8 | 0.0051 | None reported |
| High | CVE-2026-6786 | Memory safety bugs fixed in Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150 | 8.8 | 0.0050 | None reported |
| High | CVE-2026-6757 | Invalid pointer in the JavaScript: WebAssembly component | 8.8 | 0.0049 | None reported |
| High | CVE-2026-6750 | Privilege escalation in the Graphics: WebRender component | 8.8 | 0.0048 | None reported |
| High | CVE-2026-6749 | Information disclosure due to uninitialized memory in the Graphics: Canvas2D component | 8.8 | 0.0040 | None reported |
| High | CVE-2026-6747 | Use-after-free in the WebRTC component | 8.8 | 0.0040 | None reported |
| High | CVE-2026-6748 | Uninitialized memory in the Audio/Video: Web Codecs component | 9.8 | 0.0040 | None reported |
| High | CVE-2026-6772 | Incorrect boundary conditions in the Libraries component in NSS | 8.8 | 0.0039 | None reported |
| High | CVE-2026-6754 | Use-after-free in the JavaScript Engine component | 8.8 | 0.0039 | None reported |
| High | CVE-2026-6759 | Use-after-free in the Widget: Cocoa component | 8.8 | 0.0036 | None reported |
| High | CVE-2026-6784 | Memory safety bugs fixed in Firefox 150 and Thunderbird 150 | 7.5 | 0.0036 | None reported |
| High | CVE-2026-6773 | Denial-of-service due to integer overflow in the Graphics: WebGPU component | 7.5 | 0.0032 | None reported |
| High | CVE-2026-6771 | Mitigation bypass in the DOM: Security component | 9.8 | 0.0031 | None reported |
| High | CVE-2026-6751 | Uninitialized memory in the Audio/Video: Web Codecs component | 8.8 | 0.0031 | None reported |
| High | CVE-2026-6752 | Incorrect boundary conditions in the WebRTC component | 8.8 | 0.0031 | None reported |
| High | CVE-2026-6753 | Incorrect boundary conditions in the WebRTC component | 8.8 | 0.0031 | None reported |
| High | CVE-2026-6780 | Denial-of-service in the Audio/Video: Playback component | 7.5 | 0.0029 | None reported |
| High | CVE-2026-6781 | Denial-of-service in the Audio/Video: Playback component | 7.5 | 0.0029 | None reported |
| High | CVE-2026-6756 | Mitigation bypass in Firefox for Android | 7.5 | 0.0027 | None reported |
| High | CVE-2026-7321 | Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component | 9.6 | 0.0026 | None reported |
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