# RHSA-2026:0124: thunderbird security update

RHSA-2026:0124, released December 9, 2025, fixes 10 CVEs in thunderbird (version 140.6.0-1.el10_0). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2026-0124
- Platform: Linux
- Released: Dec 9, 2025
- Priority: High (Closes CVE-2025-14321, high severity)
- CVEs: 10, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2026:0124

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [thunderbird](https://patchblox.com/security/data/product/linux/thunderbird.md) | RHEL 10 | 140.6.0-1.el10_0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [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-2025-14325](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-2025-14331](https://patchblox.com/security/data/cve/CVE-2025-14331.md) | High | Same-origin policy bypass in the Request Handling component | 7.5 | 0.0019 |  |

---

Data as of 2026-11-07T12:40:37Z 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