# Firefox Developer Edition (en-US) 148.0

Firefox Developer Edition (en-US) 148.0, released February 9, 2026, fixes 54 CVEs in Firefox Developer Edition (en-US). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Firefox Developer Edition (en-US) is 156.0, which also fixes every one of these CVEs.

- Web page: https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition-148.0
- Platform: Windows apps
- Released: Feb 9, 2026
- Priority: Urgent (Closes CVE-2026-2796, rated Critical)
- CVEs: 54, exploited: 0, on CISA KEV: 0
- Superseded by: [Firefox Developer Edition (en-US) 156.0](https://patchblox.com/security/data/product/windows-app/firefox-developer-edition-en-us.md), the latest version, which also fixes every CVE listed here

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Firefox Developer Edition (en-US)](https://patchblox.com/security/data/product/windows-app/firefox-developer-edition-en-us.md) |  | 148.0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-2796](https://patchblox.com/security/data/cve/CVE-2026-2796.md) | Urgent | JIT miscompilation in the JavaScript: WebAssembly component | 9.8 | 0.0095 |  |
| [CVE-2026-2805](https://patchblox.com/security/data/cve/CVE-2026-2805.md) | Urgent | Invalid pointer in the DOM: Core & HTML component | 9.8 | 0.0066 |  |
| [CVE-2026-2799](https://patchblox.com/security/data/cve/CVE-2026-2799.md) | Urgent | Use-after-free in the DOM: Core & HTML component | 9.8 | 0.0054 |  |
| [CVE-2026-2797](https://patchblox.com/security/data/cve/CVE-2026-2797.md) | Urgent | Use-after-free in the JavaScript: GC component | 9.8 | 0.0053 |  |
| [CVE-2026-2806](https://patchblox.com/security/data/cve/CVE-2026-2806.md) | Urgent | Uninitialized memory in the Graphics: Text component | 9.1 | 0.0045 |  |
| [CVE-2026-2800](https://patchblox.com/security/data/cve/CVE-2026-2800.md) | Urgent | Spoofing issue in the WebAuthn component in Firefox for Android | 9.8 | 0.0035 |  |
| [CVE-2026-2795](https://patchblox.com/security/data/cve/CVE-2026-2795.md) | Urgent | Use-after-free in the JavaScript: GC component | 9.8 | 0.0030 |  |
| [CVE-2026-2807](https://patchblox.com/security/data/cve/CVE-2026-2807.md) | Urgent | Memory safety bugs fixed in Firefox 148 and Thunderbird 148 | 9.8 | 0.0029 |  |
| [CVE-2026-2773](https://patchblox.com/security/data/cve/CVE-2026-2773.md) | High | Incorrect boundary conditions in the Web Audio component | 9.8 | 0.0092 |  |
| [CVE-2026-2774](https://patchblox.com/security/data/cve/CVE-2026-2774.md) | High | Integer overflow in the Audio/Video component | 9.8 | 0.0085 |  |
| [CVE-2026-2775](https://patchblox.com/security/data/cve/CVE-2026-2775.md) | High | Mitigation bypass in the DOM: HTML Parser component | 9.8 | 0.0084 |  |
| [CVE-2026-2771](https://patchblox.com/security/data/cve/CVE-2026-2771.md) | High | Undefined behavior in the DOM: Core & HTML component | 9.8 | 0.0076 |  |
| [CVE-2026-2763](https://patchblox.com/security/data/cve/CVE-2026-2763.md) | High | Use-after-free in the JavaScript Engine component | 9.8 | 0.0074 |  |
| [CVE-2026-2764](https://patchblox.com/security/data/cve/CVE-2026-2764.md) | High | JIT miscompilation, use-after-free in the JavaScript Engine: JIT component | 9.8 | 0.0074 |  |
| [CVE-2026-2765](https://patchblox.com/security/data/cve/CVE-2026-2765.md) | High | Use-after-free in the JavaScript Engine component | 9.8 | 0.0074 |  |
| [CVE-2026-2766](https://patchblox.com/security/data/cve/CVE-2026-2766.md) | High | Use-after-free in the JavaScript Engine: JIT component | 9.8 | 0.0074 |  |
| [CVE-2026-2770](https://patchblox.com/security/data/cve/CVE-2026-2770.md) | High | Use-after-free in the DOM: Bindings (WebIDL) component | 9.8 | 0.0074 |  |
| [CVE-2026-2772](https://patchblox.com/security/data/cve/CVE-2026-2772.md) | High | Use-after-free in the Audio/Video: Playback component | 9.8 | 0.0074 |  |
| [CVE-2026-2447](https://patchblox.com/security/data/cve/CVE-2026-2447.md) | High | Heap buffer overflow in libvpx | 8.8 | 0.0070 |  |
| [CVE-2026-2779](https://patchblox.com/security/data/cve/CVE-2026-2779.md) | High | Incorrect boundary conditions in the Networking: JAR component | 9.8 | 0.0069 |  |
| [CVE-2026-2769](https://patchblox.com/security/data/cve/CVE-2026-2769.md) | High | Use-after-free in the Storage: IndexedDB component | 8.8 | 0.0069 |  |
| [CVE-2026-2788](https://patchblox.com/security/data/cve/CVE-2026-2788.md) | High | Incorrect boundary conditions in the Audio/Video: GMP component | 9.8 | 0.0068 |  |
| [CVE-2026-2787](https://patchblox.com/security/data/cve/CVE-2026-2787.md) | High | Use-after-free in the DOM: Window and Location component | 9.8 | 0.0064 |  |
| [CVE-2026-2762](https://patchblox.com/security/data/cve/CVE-2026-2762.md) | High | Integer overflow in the JavaScript: Standard Library component | 9.8 | 0.0063 |  |
| [CVE-2026-2791](https://patchblox.com/security/data/cve/CVE-2026-2791.md) | High | Mitigation bypass in the Networking: Cache component | 9.8 | 0.0060 |  |
| [CVE-2026-2757](https://patchblox.com/security/data/cve/CVE-2026-2757.md) | High | Incorrect boundary conditions in the WebRTC: Audio/Video component | 9.8 | 0.0059 |  |
| [CVE-2026-2785](https://patchblox.com/security/data/cve/CVE-2026-2785.md) | High | Invalid pointer in the JavaScript Engine component | 9.8 | 0.0058 |  |
| [CVE-2026-2758](https://patchblox.com/security/data/cve/CVE-2026-2758.md) | High | Use-after-free in the JavaScript: GC component | 9.8 | 0.0057 |  |
| [CVE-2026-2776](https://patchblox.com/security/data/cve/CVE-2026-2776.md) | High | Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software | 10.0 | 0.0056 |  |
| [CVE-2026-2778](https://patchblox.com/security/data/cve/CVE-2026-2778.md) | High | Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component | 10.0 | 0.0056 |  |
| [CVE-2026-2789](https://patchblox.com/security/data/cve/CVE-2026-2789.md) | High | Use-after-free in the Graphics: ImageLib component | 9.8 | 0.0053 |  |
| [CVE-2026-2786](https://patchblox.com/security/data/cve/CVE-2026-2786.md) | High | Use-after-free in the JavaScript Engine component | 9.8 | 0.0051 |  |
| [CVE-2026-2784](https://patchblox.com/security/data/cve/CVE-2026-2784.md) | High | Mitigation bypass in the DOM: Security component | 9.8 | 0.0049 |  |
| [CVE-2026-2760](https://patchblox.com/security/data/cve/CVE-2026-2760.md) | High | Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component | 10.0 | 0.0048 |  |
| [CVE-2026-2761](https://patchblox.com/security/data/cve/CVE-2026-2761.md) | High | Sandbox escape in the Graphics: WebRender component | 10.0 | 0.0048 |  |
| [CVE-2026-2759](https://patchblox.com/security/data/cve/CVE-2026-2759.md) | High | Incorrect boundary conditions in the Graphics: ImageLib component | 9.8 | 0.0048 |  |
| [CVE-2026-2767](https://patchblox.com/security/data/cve/CVE-2026-2767.md) | High | Use-after-free in the JavaScript: WebAssembly component | 9.8 | 0.0046 |  |
| [CVE-2026-2768](https://patchblox.com/security/data/cve/CVE-2026-2768.md) | High | Sandbox escape in the Storage: IndexedDB component | 10.0 | 0.0044 |  |
| [CVE-2026-2777](https://patchblox.com/security/data/cve/CVE-2026-2777.md) | High | Privilege escalation in the Messaging System component | 9.8 | 0.0044 |  |
| [CVE-2026-2781](https://patchblox.com/security/data/cve/CVE-2026-2781.md) | High | Integer overflow in the Libraries component in NSS | 9.8 | 0.0043 |  |
| [CVE-2026-2780](https://patchblox.com/security/data/cve/CVE-2026-2780.md) | High | Privilege escalation in the Netmonitor component | 9.8 | 0.0040 |  |
| [CVE-2026-2792](https://patchblox.com/security/data/cve/CVE-2026-2792.md) | High | Memory safety bugs fixed in Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148 | 9.8 | 0.0038 |  |
| [CVE-2026-2793](https://patchblox.com/security/data/cve/CVE-2026-2793.md) | High | Memory safety bugs fixed in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148 | 9.8 | 0.0038 |  |
| [CVE-2026-2783](https://patchblox.com/security/data/cve/CVE-2026-2783.md) | High | Information disclosure due to JIT miscompilation in the JavaScript Engine: JIT component | 7.5 | 0.0034 |  |
| [CVE-2026-2782](https://patchblox.com/security/data/cve/CVE-2026-2782.md) | High | Privilege escalation in the Netmonitor component | 9.8 | 0.0034 |  |
| [CVE-2026-2801](https://patchblox.com/security/data/cve/CVE-2026-2801.md) | High | Incorrect boundary conditions in the JavaScript: WebAssembly component | 7.5 | 0.0034 |  |
| [CVE-2026-2794](https://patchblox.com/security/data/cve/CVE-2026-2794.md) | High | Information disclosure due to uninitialized memory in Firefox and Firefox Focus for Android | 7.5 | 0.0030 |  |
| [CVE-2026-2798](https://patchblox.com/security/data/cve/CVE-2026-2798.md) | High | Use-after-free in the DOM: Core & HTML component | 8.8 | 0.0030 |  |
| [CVE-2026-2803](https://patchblox.com/security/data/cve/CVE-2026-2803.md) | High | Information disclosure, mitigation bypass in the Settings UI component | 7.5 | 0.0029 |  |
| [CVE-2026-24869](https://patchblox.com/security/data/cve/CVE-2026-24869.md) | High | Use-after-free in the Layout: Scrolling and Overflow component | 8.8 | 0.0028 |  |
| [CVE-2026-2790](https://patchblox.com/security/data/cve/CVE-2026-2790.md) | High | Same-origin policy bypass in the Networking: JAR component | 9.8 | 0.0025 |  |
| [CVE-2026-2804](https://patchblox.com/security/data/cve/CVE-2026-2804.md) | Routine | Use-after-free in the JavaScript: WebAssembly component | 5.4 | 0.0047 |  |
| [CVE-2026-24868](https://patchblox.com/security/data/cve/CVE-2026-24868.md) | Routine | Mitigation bypass in the Privacy: Anti-Tracking component | 6.5 | 0.0022 |  |
| [CVE-2026-2802](https://patchblox.com/security/data/cve/CVE-2026-2802.md) | Routine | Race condition in the JavaScript: GC component | 4.2 | 0.0016 |  |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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