CVE-2026-125108

Name	CVE-2026-125108
Description	Rack is a modular Ruby web server interface. Prior to 2.2.25, 3.1.23, and 3.2.8, Rack::Multipart::Parser.parse_boundary can skip a leading empty or quoted boundary parameter in a multipart Content-Type header and accept a later parameter. Rack can therefore parse a request body with a boundary that a conforming intermediary would not derive, allowing form fields or file uploads to reach an application without the intended proxy or web application firewall inspection. This issue is fixed in versions 2.2.25, 3.1.23, and 3.2.8.
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-rack (PTS)	bookworm	2.2.22-0+deb12u1	vulnerable
	bookworm (security)	2.2.22-0+deb12u2	vulnerable
	trixie	3.1.20-0+deb13u1	vulnerable
	trixie (security)	3.1.20-0+deb13u2	vulnerable
	forky, sid	3.2.8-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
ruby-rack	source	(unstable)	3.2.8-1

https://github.com/rack/rack/security/advisories/GHSA-p8x9-v4hv-2w4g