# Mozilla Thunderbird ESR (ko) 140.3.0

Mozilla Thunderbird ESR (ko) 140.3.0, released September 17, 2025, fixes 5 CVEs in Mozilla Thunderbird ESR (ko). None of them is reported as exploited. Patch Radar priority: High. The latest Mozilla Thunderbird ESR (ko) is 153.7.0, which also fixes every one of these CVEs.

- Web page: https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.esr.ko-140.3.0
- Platform: Windows apps
- Released: Sep 17, 2025
- Priority: High (Closes CVE-2025-10533, high severity)
- CVEs: 5, exploited: 0, on CISA KEV: 0
- Superseded by: [Mozilla Thunderbird ESR (ko) 153.7.0](https://patchblox.com/security/data/product/windows-app/mozilla-thunderbird-esr-ko.md), the latest version, which also fixes every CVE listed here

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Mozilla Thunderbird ESR (ko)](https://patchblox.com/security/data/product/windows-app/mozilla-thunderbird-esr-ko.md) |  | 140.3.0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2025-10533](https://patchblox.com/security/data/cve/CVE-2025-10533.md) | High | Integer overflow in the SVG component | 8.8 | 0.0078 |  |
| [CVE-2025-10528](https://patchblox.com/security/data/cve/CVE-2025-10528.md) | High | Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component | 7.5 | 0.0037 |  |
| [CVE-2025-10532](https://patchblox.com/security/data/cve/CVE-2025-10532.md) | High | Incorrect boundary conditions in the JavaScript: GC component | 7.5 | 0.0033 |  |
| [CVE-2025-10527](https://patchblox.com/security/data/cve/CVE-2025-10527.md) | High | Sandbox escape due to use-after-free in the Graphics: Canvas2D component | 7.5 | 0.0029 |  |
| [CVE-2025-10536](https://patchblox.com/security/data/cve/CVE-2025-10536.md) | High | Information disclosure in the Networking: Cache component | 7.5 | 0.0018 |  |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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