Vulnerabilities CVE-2026-73248

CVE-2026-73248

High

Open

TLP:CLEAR

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

NVD CVE.org

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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.

Details

CVSS Score: 8.5
EPSS Score ⓘ: 0.15%

4.6th percentile
CVSS Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Confidence: 90%
Published: Aug 11, 2026
Last Modified: Aug 12, 2026

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