# CVE-2026-26065: calibre: calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books

CVE-2026-26065 is fixed in calibre on 1 platform, first by DEBIAN-CVE-2026-26065, released February 20, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-26065
- Priority: High
- CVSS: 8.8 (high)
- EPSS: 0.0059
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 20, 2026

## Description

calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Versions 9.2.1 and below are vulnerable to Path Traversal through PDB readers (both 132-byte and 202-byte header variants) that allow arbitrary file writes with arbitrary extension and arbitrary content anywhere the user has write permissions. Files are written in 'wb' mode, silently overwriting existing files. This can lead to potential code execution and Denial of Service through file corruption. This issue has been fixed in version 9.3.0.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | calibre Debian 12.15 (bookworm) | 6.13.0+repack-2+deb12u6 | [DEBIAN-CVE-2026-26065](https://patchblox.com/security/data/fix/linux/debian-cve-2026-26065.md) | Feb 20, 2026 |
| Linux | calibre Debian 13.5 (trixie) | 8.5.0+ds-1+deb13u2 | [DEBIAN-CVE-2026-26065](https://patchblox.com/security/data/fix/linux/debian-cve-2026-26065.md) | Feb 20, 2026 |
| Linux | calibre Debian 14 | 9.3.0+ds+~0.10.5-1 | [DEBIAN-CVE-2026-26065](https://patchblox.com/security/data/fix/linux/debian-cve-2026-26065.md) | Feb 20, 2026 |

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Data as of 2026-11-08T13:06:02Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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