Vulnerability in Docker Engine
CVE-2026-42306
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.
EPSS: 0.001 (1.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:H/A:H.
Affected products
- Docker Engine
- Moby — versions github.com/docker/docker/daemon <= 28.5.2, Docker Engine < 29.5.1, github.com/moby/moby/v2/daemon < 2.0.0-beta.14
- Mobyproject Moby
- Mobyproject Moby\/v2 — versions 2.0.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-42306?
- CVE-2026-42306 is a high-severity vulnerability in Docker Engine, classified under UNIX Symbolic Link (Symlink) Following. CVSS score: 7.2/10. Published 2026-06-12.
- How severe is CVE-2026-42306?
- High severity. CVSS v3 base score is 7.2 out of 10.