CVE-2026-42306

Name	CVE-2026-42306
Description	Moby is an open source container framework. In Docker Engine prior to version 29.5.1, Docker Daemon versions 28.5.2 and prior, and Moby Daemon prior to version 2.0.0-beta.14, a race condition during docker cp mount setup allows a malicious container to redirect a bind mount target to an arbitrary host path, potentially overwriting host files or causing denial of service. This issue has been patched in Docker Engine version 29.5.1 and Moby Daemon version 2.0.0-beta.14.
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	1139967

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+dfsg4-3	fixed

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)	28.5.2+dfsg4-3			1139967

Notes

https://github.com/moby/moby/security/advisories/GHSA-rg2x-37c3-w2rh
Fixed by: https://github.com/moby/moby/commit/43fa458a9c40873867e75221454de10709b04236 (docker-v29.5.1)