CVE-2026-25731

Name	CVE-2026-25731
Description	calibre is an e-book manager. Prior to 9.2.0, a Server-Side Template Injection (SSTI) vulnerability in Calibre's Templite templating engine allows arbitrary code execution when a user converts an ebook using a malicious custom template file via the --template-html or --template-html-index command-line options. This vulnerability is fixed in 9.2.0.
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+deb11u3	vulnerable
	bookworm	6.13.0+repack-2+deb12u5	vulnerable
	trixie	8.5.0+ds-1+deb13u1	vulnerable
	forky	8.16.2+ds+~0.10.5-3	vulnerable
	sid	9.2.0+ds+~0.10.5-1	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)	9.2.0+ds+~0.10.5-1

Notes

https://github.com/kovidgoyal/calibre/security/advisories/GHSA-xrh9-w7qx-3gcc
Fixed by: https://github.com/kovidgoyal/calibre/commit/f0649b27512e987b95fcab2e1e0a3bcdafc23379 (v9.2.0)