UNIX Symbolic Link (Symlink) Following Affecting github.com/moby/moby/v2 package, versions <2.0.0-beta.14
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published19 May 2026
- disclosed18 May 2026
- creditUnknown
Introduced: 18 May 2026
CVE-2026-42306 Â (opens in a new tab)How to fix?
Upgrade github.com/moby/moby/v2 to version 2.0.0-beta.14 or higher.
Overview
Affected versions of this package are vulnerable to UNIX Symbolic Link (Symlink) Following during docker cp mount setup before subsequent mount syscall. An attacker can overwrite arbitrary files on the host or cause denial of service by exploiting a race condition where a symlink is created at the mount destination path before the bind mount occurs, redirecting the mount to an unintended host location. This is only exploitable if a container has at least one volume mount, a process inside the container can rapidly create and swap symlinks at the mount destination, and an operator initiates a docker cp or calls the relevant archive API endpoints.
Workaround
This vulnerability can be mitigated by only running containers from trusted images, avoiding the use of docker cp with untrusted running containers, and using authorization plugins to restrict access to the archive API endpoints.