CVE-2026-73248

Name	CVE-2026-73248
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
calibre (PTS)	bullseye	5.12.0+dfsg-1+deb11u2	vulnerable
	bullseye (security)	5.12.0+dfsg-1+deb11u5	vulnerable
	bookworm	6.13.0+repack-2+deb12u9	vulnerable
	trixie	8.5.0+ds-1+deb13u3	vulnerable
	forky, sid	9.13.0+ds+~0.10.6-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
calibre	source	(unstable)	9.12.0+ds+~0.10.6-1

Notes

https://github.com/kovidgoyal/calibre/security/advisories/GHSA-4f7g-rjfp-hmvx
Fixed by: https://github.com/kovidgoyal/calibre/commit/dac9990458374a81a5372a768bba6527d965aac8 (v9.12.0)