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CVE PROGRAM SOURCE RECORD8.5 High

CVE-2026-73248

calibre: Bypass of Python template restrictions via nested `template()` leading to RCE

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

kovidgoyal calibre

  • < 9.12.0affected

References