CVE-2026-85396

Name	CVE-2026-85396
Description	rubyzip versions before 3.4.0 contain a path traversal vulnerability in Zip::Entry#extract that fails to properly validate extraction paths using prefix comparison without trailing separators. Attackers can craft archive entries with names like ../upload_backup/owned.sh to write files outside the intended extraction directory into sibling paths sharing the destination prefix.
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
ruby-zip (PTS)	bookworm, trixie	2.3.2-1	vulnerable
	forky, sid	3.5.0+dfsg-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
ruby-zip	source	(unstable)	3.4.0+dfsg-1

https://github.com/rubyzip/rubyzip/issues/664
Fixed by: https://github.com/rubyzip/rubyzip/commit/17edfbf4423b83211b075acc23a7d8640da63449 (v3.4.0)