# Mozilla Thunderbird ESR (gl) 128.6.0

Mozilla Thunderbird ESR (gl) 128.6.0, released January 8, 2025, fixes 7 CVEs in Mozilla Thunderbird ESR (gl). None of them is reported as exploited. Patch Radar priority: High. The latest Mozilla Thunderbird ESR (gl) is 153.7.0, which also fixes every one of these CVEs.

- Web page: https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.esr.gl-128.6.0
- Platform: Windows apps
- Released: Jan 8, 2025
- Priority: High (Closes CVE-2025-0242, high severity)
- CVEs: 7, exploited: 0, on CISA KEV: 0
- Superseded by: [Mozilla Thunderbird ESR (gl) 153.7.0](https://patchblox.com/security/data/product/windows-app/mozilla-thunderbird-esr-gl.md), the latest version, which also fixes every CVE listed here

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Mozilla Thunderbird ESR (gl)](https://patchblox.com/security/data/product/windows-app/mozilla-thunderbird-esr-gl.md) |  | 128.6.0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2025-0242](https://patchblox.com/security/data/cve/CVE-2025-0242.md) | High | Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 115.19, Firefox ESR 128.6, Thunderbird 115.19, and Thunderbird 128.6 | 8.8 | 0.1472 |  |
| [CVE-2025-0241](https://patchblox.com/security/data/cve/CVE-2025-0241.md) | High | Memory corruption when using JavaScript Text Segmentation | 7.7 | 0.0073 |  |
| [CVE-2025-0243](https://patchblox.com/security/data/cve/CVE-2025-0243.md) | High | Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and Thunderbird 128.6 | 7.5 | 0.0025 |  |
| [CVE-2025-0238](https://patchblox.com/security/data/cve/CVE-2025-0238.md) | Routine | Use-after-free when breaking lines in text | 6.5 | 0.0079 |  |
| [CVE-2025-0240](https://patchblox.com/security/data/cve/CVE-2025-0240.md) | Routine | Compartment mismatch when parsing JavaScript JSON module | 6.5 | 0.0067 |  |
| [CVE-2025-0237](https://patchblox.com/security/data/cve/CVE-2025-0237.md) | Routine | WebChannel APIs susceptible to confused deputy attack | 6.8 | 0.0060 |  |
| [CVE-2025-0239](https://patchblox.com/security/data/cve/CVE-2025-0239.md) | Routine | Alt-Svc ALPN validation failure when redirected | 5.4 | 0.0023 |  |

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Data as of 2026-11-11T19:49:26Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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