CVE-2026-33748

Name	CVE-2026-33748
Description	BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to version 0.28.1, insufficient validation of Git URL fragment subdir components may allow access to files outside the checked-out Git repository root. Possible access is limited to files on the same mounted filesystem. The issue has been fixed in version v0.28.1 The issue affects only builds that use Git URLs with a subpath component. As a workaround, avoid building Dockerfiles from untrusted sources or using the subdir component from an untrusted Git repository where the subdir component could point to a symlink.
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)
Debian Bugs	1094971

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
docker.io (PTS)	bullseye	20.10.5+dfsg1-1+deb11u2	vulnerable
	bullseye (security)	20.10.5+dfsg1-1+deb11u4	vulnerable
	bookworm	20.10.24+dfsg1-1+deb12u1	vulnerable
	trixie	26.1.5+dfsg1-9	vulnerable
	forky, sid	28.5.2+dfsg4-1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
docker.io	source	(unstable)	(unfixed)
golang-github-moby-buildkit	ITP					1094971