# Mozilla Thunderbird (en-US) 146.0

Mozilla Thunderbird (en-US) 146.0, released December 10, 2025, fixes 13 CVEs in Mozilla Thunderbird (en-US). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Thunderbird (en-US) is 159.0, which also fixes every one of these CVEs.

- Web page: https://patchblox.com/security/fix/windows-app/mozilla.thunderbird-146.0
- Platform: Windows apps
- Released: Dec 10, 2025
- Priority: Urgent (Closes CVE-2025-14326, rated Critical)
- CVEs: 13, exploited: 0, on CISA KEV: 0
- Superseded by: [Mozilla Thunderbird (en-US) 159.0](https://patchblox.com/security/data/product/windows-app/mozilla-thunderbird-en-us.md), the latest version, which also fixes every CVE listed here

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Mozilla Thunderbird (en-US)](https://patchblox.com/security/data/product/windows-app/mozilla-thunderbird-en-us.md) |  | 146.0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2025-14326](https://patchblox.com/security/data/cve/CVE-2025-14326.md) | Urgent | Use-after-free in the Audio/Video: GMP component | 9.8 | 0.0046 |  |
| [CVE-2025-14321](https://patchblox.com/security/data/cve/CVE-2025-14321.md) | High | Use-after-free in the WebRTC: Signaling component | 9.8 | 0.0060 |  |
| [CVE-2025-14324](https://patchblox.com/security/data/cve/CVE-2025-14324.md) | High | JIT miscompilation in the JavaScript Engine: JIT component | 9.8 | 0.0057 |  |
| [CVE-2025-14330](https://patchblox.com/security/data/cve/CVE-2025-14330.md) | High | JIT miscompilation in the JavaScript Engine: JIT component | 9.8 | 0.0051 |  |
| [CVE-2025-14333](https://patchblox.com/security/data/cve/CVE-2025-14333.md) | High | Memory safety bugs fixed in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146 | 8.1 | 0.0044 |  |
| [CVE-2025-14323](https://patchblox.com/security/data/cve/CVE-2025-14323.md) | High | Privilege escalation in the DOM: Notifications component | 8.8 | 0.0042 |  |
| [CVE-2025-14328](https://patchblox.com/security/data/cve/CVE-2025-14328.md) | High | Privilege escalation in the Netmonitor component | 8.8 | 0.0040 |  |
| [CVE-2025-14329](https://patchblox.com/security/data/cve/CVE-2025-14329.md) | High | Privilege escalation in the Netmonitor component | 8.8 | 0.0040 |  |
| [CVE-2025-14327](https://patchblox.com/security/data/cve/CVE-2025-14327.md) | High | Spoofing issue in the Downloads Panel component | 7.5 | 0.0038 |  |
| [CVE-2025-14325](https://patchblox.com/security/data/cve/CVE-2025-14325.md) | High | JIT miscompilation in the JavaScript Engine: JIT component | 7.5 | 0.0034 |  |
| [CVE-2025-14322](https://patchblox.com/security/data/cve/CVE-2025-14322.md) | High | Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component | 8.0 | 0.0034 |  |
| [CVE-2025-14332](https://patchblox.com/security/data/cve/CVE-2025-14332.md) | High | Memory safety bugs fixed in Firefox 146 and Thunderbird 146 | 7.3 | 0.0031 |  |
| [CVE-2025-14331](https://patchblox.com/security/data/cve/CVE-2025-14331.md) | High | Same-origin policy bypass in the Request Handling component | 7.5 | 0.0019 |  |

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Data as of 2026-11-09T13:31:49Z 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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