calibre: calibre is an e-book manager
CVE-2026-73248 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2026-73248, released August 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.
calibre is an e-book manager. Prior to 9.12.0, calibre processes attacker-controlled composite_template metadata from a malicious EPUB, OPF, PDF, or similar file through program: and a nested template() call whose formatter does not inherit allow_python_templates=False, allowing a nested python: template to reach compile_python_template and execute arbitrary Python code when the file is opened or imported. This issue is fixed in version 9.12.0.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| calibre · Debian 14 | 9.12.0+ds+~0.10.6-1 | DEBIAN-CVE-2026-73248 | Aug 13, 2026 |
| calibre · Fedora 43 | 9.13.0-1.fc43 | FEDORA-2026-C10ED2F3B7 | Aug 16, 2026 |
| calibre-debuginfo · Fedora 43 | 9.13.0-1.fc43 | FEDORA-2026-C10ED2F3B7 | Aug 16, 2026 |
| calibre-debugsource · Fedora 43 | 9.13.0-1.fc43 | FEDORA-2026-C10ED2F3B7 | Aug 16, 2026 |
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