# CVE-2026-73249: calibre: calibre is an e-book manager

CVE-2026-73249 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2026-73249, released August 13, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-73249
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0044
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 11, 2026

## Description

calibre is an e-book manager. Prior to 9.12.0, the calibre Content Server endpoint POST /book-update-annotations/{library_id}/{book_id}/{fmt} in src/calibre/srv/books.py omits needs_db_write=True, causing Router.dispatch() to skip ctx.check_for_write_access() before update_annotations() passes attacker-controlled JSON to db.merge_annotations_for_book(), which allows a readonly user or an anonymous user on an unauthenticated deployment to persist unauthorized book annotation changes. This issue is fixed in version 9.12.0.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | calibre Debian 14 | 9.12.0+ds+~0.10.6-1 | [DEBIAN-CVE-2026-73249](https://patchblox.com/security/data/fix/linux/debian-cve-2026-73249.md) | Aug 13, 2026 |
| Linux | calibre Fedora 43 | 9.13.0-1.fc43 | [FEDORA-2026-C10ED2F3B7](https://patchblox.com/security/data/fix/linux/fedora-2026-c10ed2f3b7.md) | Aug 16, 2026 |
| Linux | calibre-debuginfo Fedora 43 | 9.13.0-1.fc43 | [FEDORA-2026-C10ED2F3B7](https://patchblox.com/security/data/fix/linux/fedora-2026-c10ed2f3b7.md) | Aug 16, 2026 |
| Linux | calibre-debugsource Fedora 43 | 9.13.0-1.fc43 | [FEDORA-2026-C10ED2F3B7](https://patchblox.com/security/data/fix/linux/fedora-2026-c10ed2f3b7.md) | Aug 16, 2026 |

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Data as of 2026-11-08T00:53:09Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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