CVE-2026-42306

Description

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.

CVSS v3.1 Score

7.2

HIGH

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

EPSS — Exploit Prediction

0.0010

Probability of exploitation

0.01%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-61 CWE-61

CWE-367 CWE-367

Affected Products

Vendor	Product	Versions
docker	engine	< 29.5.1
mobyproject	moby	< 28.5.2
mobyproject	moby\/v2	All
mobyproject	moby\/v2	All
mobyproject	moby\/v2	All
mobyproject	moby\/v2	All
mobyproject	moby\/v2	All
mobyproject	moby\/v2	All
mobyproject	moby\/v2	All
mobyproject	moby\/v2	All
mobyproject	moby\/v2	All
mobyproject	moby\/v2	All
mobyproject	moby\/v2	All
mobyproject	moby\/v2	All
mobyproject	moby\/v2	All
mobyproject	moby\/v2	All

References

Advisories & Patches

https://github.com/moby/moby/security/advisories/GHSA-rg2x-37c3-w2rh

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.2 (HIGH).

How severe is CVE-2026-42306? +

CVE-2026-42306 has a CVSS v3.1 score of 7.2 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0010, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-42306? +

CVE-2026-42306 affects products from docker, mobyproject, specifically: engine, moby, moby\/v2. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-42306? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-5223

Cargo incorrectly handled symlinks inside of crate tarballs downloaded from third-party registries, allowing a malicious crate to override the source …

CVE-2026-31893

Tunnelblick is an open source graphic user interface for OpenVPN on macOS. In versions 3.3beta26 through 9.0beta01, any local user …

CVE-2025-29787

`zip` is a zip library for rust which supports reading and writing of simple ZIP files. In the archive extraction …

CVE-2025-57802

Airlink's Daemon interfaces with Docker and the Panel to provide secure access for controlling instances via the Panel. In version …

CVE-2025-46810

A UNIX Symbolic Link (Symlink) Following vulnerability in the packaging of openSUSE Tumbleweed traefik2 allows the traefik user to escalate …

CVE-2025-59825

astral-tokio-tar is a tar archive reading/writing library for async Rust. In versions 0.5.3 and earlier of astral-tokio-tar, tar archives may …