CVE-2026-73248
High
Description
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.
SeverityHigh
CVSS8.5
Exploit probability—
ProductKovidgoyal Calibre
PublishedAug 11, 2026
First seenAug 11, 2026
Weakness typeCWE-94Code injectionCWE-95CWE-95
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| kovidgoyal calibre | < 9.12.0 | — |
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