# CVE-2026-53511: calibre: calibre is an e-book manager

CVE-2026-53511 is fixed in calibre on 1 platform, first by DEBIAN-CVE-2026-53511, released July 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-53511
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 7, 2026

## Description

calibre is an e-book manager. Prior to 9.10.0, a malicious EPUB, OPF, or PDF file can execute arbitrary Python code when its metadata is read by calibre, including through Add books or Edit books, by embedding a custom column definition with a python: template in calibre:user_metadata that is passed unsanitized to exec() in the template formatter. This issue is fixed in version 9.10.0.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | calibre Debian 12.15 (bookworm) | 6.13.0+repack-2+deb12u10 | [DEBIAN-CVE-2026-53511](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53511.md) | Jul 8, 2026 |
| Linux | calibre Debian 14 | 9.10.0+ds+~0.10.6-1 | [DEBIAN-CVE-2026-53511](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53511.md) | Jul 8, 2026 |

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Data as of 2026-11-08T19:12:23Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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