# Python 3.13 3.13.12

Python 3.13 3.13.12, released February 3, 2026, fixes 5 CVEs in Python 3.13. None of them is reported as exploited. Patch Radar priority: High. The latest Python 3.13 is 3.13.17, which also fixes every one of these CVEs.

- Web page: https://patchblox.com/security/fix/windows-app/python.python.3.13-3.13.12
- Platform: Windows apps
- Released: Feb 3, 2026
- Priority: High (Closes CVE-2026-1299, high severity)
- CVEs: 5, exploited: 0, on CISA KEV: 0
- Superseded by: [Python 3.13 3.13.17](https://patchblox.com/security/data/product/windows-app/python-3.13.md), the latest version, which also fixes every CVE listed here

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Python 3.13](https://patchblox.com/security/data/product/windows-app/python-3.13.md) |  | 3.13.12 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-1299](https://patchblox.com/security/data/cve/CVE-2026-1299.md) | High | email BytesGenerator header injection due to unquoted newlines | 7.1 | 0.0057 |  |
| [CVE-2026-0865](https://patchblox.com/security/data/cve/CVE-2026-0865.md) | High | wsgiref.headers.Headers allows header newline injection | 8.1 | 0.0055 |  |
| [CVE-2025-15282](https://patchblox.com/security/data/cve/CVE-2025-15282.md) | High | Header injection via newlines in data URL mediatype | 8.1 | 0.0054 |  |
| [CVE-2026-0672](https://patchblox.com/security/data/cve/CVE-2026-0672.md) | High | Header injection in http.cookies.Morsel | 8.1 | 0.0048 |  |
| [CVE-2025-11468](https://patchblox.com/security/data/cve/CVE-2025-11468.md) | Routine | Folding email comments of unfoldable characters doesn't preserve parenthesis | 5.7 | 0.0062 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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