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.

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…

EPSS: 0.001 (1.2th 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.