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

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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.

Source published

12 Jun 2026 18:09:22 UTC

Source modified

13 Jun 2026 03:25:47 UTC

Saved here

23 Oct 2026 15:48:27 UTC

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

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.

Source published

Jun 12, 2026, 6:09:22 PM (timezone not stated)

Source modified

Jun 13, 2026, 3:25:47 AM (timezone not stated)

Saved here

13 Nov 2026 12:03:04 UTC

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

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.

Source published

12 Jun 2026 19:16:27 UTC

Source modified

17 Jun 2026 10:47:39 UTC

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25 Oct 2026 10:17:10 UTC

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CVSS 3.1 · [email protected] · Secondary · 7.2 CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:H/A:H

CVSS 3.1 · [email protected] · Primary · 7.2 CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:H/A:H

## Summary 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. ## Details When copying files into a container, the daemon sets up a temporary filesystem view by bind-mounting volumes into a private mount namespace. During this setup, the mount destination is created inside the container root and then a bind mount is attached using the container-relative path resolved to an absolute host path. Between mountpoint creation and the `mount()` syscall, a process running inside the container can replace the destination (or a parent path component) with a symlink pointing to an arbitrary location on the host. The `mount()` syscall follows the symlink, causing the volume to be bind-mounted onto an arbitrary host path instead of the intended container path. ## Impact A malicious container can redirect a volume bind mount to an arbitrary host path. The impact depends on the volume content and mount options: - If the volume is writable, arbitrary host files at the redirected path could be overwritten with the volume's contents. - If the volume is read-only, the host path is masked by the mount for the duration of the operation, causing denial of service. - In all cases the mount is temporary (torn down after the `docker cp` completes), but the effects of any writes persist. ### Conditions for exploitation - A container must have at least one volume mount. - A process inside the container must be able to rapidly create and swap symlinks at the volume mount destination path. - An operator must initiate a `docker cp` into that container, or call the `PUT /containers/{id}/archive` or `HEAD /containers/{id}/archive` API endpoints. ### Not affected - Containers that do not have volume mounts are not affected, as the race occurs during volume bind-mount setup. ## Workarounds - Only run containers from trusted images. - Avoid using `docker cp` with untrusted running containers. - Use authorization plugins to restrict access to the archive API endpoints (`PUT /containers/{id}/archive`, `HEAD /containers/{id}/archive`).

Source published

18 May 2026 17:53:08 UTC

Source modified

10 Sep 2026 03:50:47 UTC

Saved here

24 Oct 2026 13:19:41 UTC

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GitHub Advisory Database · CC-BY-4.0

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CVSS_V3 · CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:H/A:H

Publisher rating · HIGH

A race condition in the Docker daemon allows an attacker to redirect bind mounts to arbitrary host paths during a "docker cp" operation. The affected code is in the daemon package, specifically the openContainerFS method. This is daemon-owned, Linux-specific code and is not intended for external use as a Go library.

Source published

25 Jun 2026 22:34:34 UTC

Source modified

28 Jul 2026 16:30:26 UTC

Saved here

24 Oct 2026 13:19:41 UTC

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OSV · upstream source license applies

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