Mozilla Firefox (ff) 150.0
Mozilla Firefox (ff) 150.0, released April 21, 2026, fixes 42 CVEs in Mozilla Firefox (ff). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Firefox (ff) is 159.0, which also fixes every one of these CVEs.
Superseded. The latest Mozilla Firefox (ff) 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 (ff) | 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 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.