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Vulnerability record · CVE-2026-73248 · published 11 August 2026

CVE-2026-73248: Code injection vulnerability

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.

8.5 CVSS 4.0 High EPSS 0.20% · top 91.5% CWE-94 · Code injectionCWE-95 · CWE-95 Deferred
8.5CVSS 4.0 base score
0.20%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
9 Sep 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/kovidgoyal/calibre/commit/dac9990458374a81a5372a768bba6527d965aac8
https://github.com/kovidgoyal/calibre/releases/tag/v9.12.0
https://github.com/kovidgoyal/calibre/security/advisories/GHSA-4f7g-rjfp-hmvx
https://github.com/kovidgoyal/calibre/security/advisories/GHSA-4f7g-rjfp-hmvx

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Source: NIST National Vulnerability Database (record CVE-2026-73248), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.