CVE-2026-25636

Name	CVE-2026-25636
Description	calibre is an e-book manager. In 9.1.0 and earlier, a path traversal vulnerability in Calibre's EPUB conversion allows a malicious EPUB file to corrupt arbitrary existing files writable by the Calibre process. During conversion, Calibre resolves CipherReference URI from META-INF/encryption.xml to an absolute filesystem path and opens it in read-write mode, even when it points outside the conversion extraction directory. 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, sid	9.5.0+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

[trixie] - calibre <no-dsa> (Will be fixed via point update)
[bookworm] - calibre <no-dsa> (Will be fixed via point update)
[bullseye] - calibre <postponed> (Can be piggy-back'd with future DLA)
https://github.com/kovidgoyal/calibre/security/advisories/GHSA-8r26-m7j5-hm29
Fixed by: https://github.com/kovidgoyal/calibre/commit/9484ea82c6ab226c18e6ca5aa000fa16de598726 (v9.2.0)