CVE-2026-42306: Moby is an open source container framework

Routine

HIGH 7.2WATCHLISTUPGRADEUPGRADEDOWNGRADE

CVE-2026-42306 is a high-severity flaw (CVSS 7.2) affecting engine, moby, moby\/v2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-61, CWE-367
Published	2026-06-12
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: docker · mobyproject

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-12 19:16 UTCPublished CVE record published
2026-06-17 10:47 UTCUpdated Record last modified

docker engine UPGRADE

Affected: < 29.5.1

Fixed in: 29.5.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy engine || rpm -q engine || engine --version

2. UPGRADE to 29.5.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade engine

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade engine

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

mobyproject moby UPGRADE

Affected: <= 28.5.2

Fixed in: newer than 28.5.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy moby || rpm -q moby || moby --version

2. UPGRADE to newer than 28.5.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade moby

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade moby

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

mobyproject moby\/v2 DOWNGRADE

Affected: 2.0.0 beta0 · 2.0.0 beta1 · 2.0.0 beta10 · 2.0.0 beta11 · 2.0.0 beta12 · 2.0.0 beta13 · 2.0.0 beta2 · 2.0.0 beta3

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy mobyv2 || rpm -q mobyv2 || mobyv2 --version

2. No fixed release: DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison mobyv2 sudo apt install mobyv2=<VERSION_BEFORE_2.0.0> sudo apt-mark hold mobyv2

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mobyv2 sudo dnf downgrade mobyv2-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add mobyv2

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42306?

engine: upgrade to 29.5.1; moby: upgrade to newer than 28.5.2; moby\/v2: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-42306 being exploited?

CVE-2026-42306 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42306 affect?

CVE-2026-42306 affects engine, moby, moby\/v2. Severity is high (CVSS 7.2). 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

How urgent is CVE-2026-42306?

Priority 30/100. High severity; On your watchlist

Software pages

Docker vulnerabilities

Related CVEs

CVE-2026-41568 MEDIUM 6.1 UPGRADE UPGRADE Moby is an open source container framework

References

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