CVE-2026-42306

Moby: Race condition in docker cp allows bind mount redirection to host path

State: Published
Severity: 7.2 High
Published: Jun 12, 2026
Updated: Jun 13, 2026
Reserved: Apr 26, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.2 High	CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:H/A:H	GitHub_M

Weaknesses

CWE-61 UNIX Symbolic Link (Symlink) Following
CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

Affected Products

Product	Versions
mobymoby	github.com/docker/docker/daemon <= 28.5.2Affected Docker Engine < 29.5.1Affected github.com/moby/moby/v2/daemon < 2.0.0-beta.14Affected

References

https://github.com/moby/moby/security/advisories/GHSA-rg2x-37c3-w2rh

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