CVE-2026-26064

Name	CVE-2026-26064
Description	calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Versions 9.2.1 and below contain a Path Traversal vulnerability that allows arbitrary file writes anywhere the user has write permissions. On Windows, this leads to Remote Code Execution by writing a payload to the Startup folder, which executes on next login. Function extract_pictures only checks startswith('Pictures'), and does not sanitize '..' sequences. calibre's own ZipFile.extractall() in utils/zipfile.py does sanitize '..' via _get_targetpath(), but extract_pictures() bypasses this by using manual zf.read() + open(). This issue has been fixed in version 9.3.0.
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	9.3.0+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)	9.3.0+ds+~0.10.5-1

Notes

https://github.com/kovidgoyal/calibre/security/advisories/GHSA-72ch-3hqc-pgmp
Fixed by: https://github.com/kovidgoyal/calibre/commit/e1b5f9b45a5e8fa96c136963ad9a1d35e6adac62 (v9.3.0)