🛡️ CVE-2026-42306 on Debian — docker.io

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Distribution advisory

This page covers CVE-2026-42306 as tracked by Debian, for the package docker.io. The fix is available in version 28.5.2+dfsg4-3; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, an attacker needs low-level privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality none, integrity high, availability high.

Weakness class

DEBIAN-CVE-2026-42306 is classified as CWE-61: UNIX Symbolic Link (Symlink) Following. The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere.

Affected software

DEBIAN-CVE-2026-42306 is recorded against 1 package.

  • docker.io (fixed in 28.5.2+dfsg4-3)

Timeline and source

Published on 12 June 2026 and last revised on 16 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security-tracker.debian.org (Advisory)

CVE-2026-42306 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-06-12
Updated 2026-08-20
Modified 2026-08-16
Fix URL N/A

Affected Packages

Software From version Fixed in
docker.io — 28.5.2+dfsg4-3

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