CVE-2026-42306 PUBLISHED

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

Assigner: GitHub_M
Reserved: 26.04.2026 Published: 12.06.2026 Updated: 13.06.2026

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.

Metrics

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

Product Status

Vendor moby
Product moby
Versions
  • Version github.com/docker/docker/daemon <= 28.5.2 is affected
  • Version Docker Engine < 29.5.1 is affected
  • Version github.com/moby/moby/v2/daemon < 2.0.0-beta.14 is affected

References

Problem Types

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