CVE-2026-42306 | Moby: Race condition in docker cp allows bind mount redirection to host path

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.

Published: 2026-06-12 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-42306 is rated Low Risk (29.3/100): CVSS High severity, with low exploitation likelihood (EPSS 0.10%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-42306

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.01% 0.10% +0.09%
2 2026-06-12 — 0.01% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-42306

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.2 3.1 HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 0.8 5.8 [email protected]
7.2 3.1 HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 0.8 5.8 [email protected]

Weakness enumeration for CVE-2026-42306

GitHub Security Advisory for CVE-2026-42306

GHSA-rg2x-37c3-w2rh · Severity: high · Ecosystem: go — Docker: Race condition in docker cp allows bind mount redirection to host path

OS Trackers for CVE-2026-42306

vendor priority summary link
debian not yet assigned CVE-2026-42306 not yet assigned priority: Debian including 1 source packages (docker.io), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 4, resolved 1. https://security-tracker.debian.org/tracker/CVE-2026-42306
ubuntu medium CVE-2026-42306 medium priority: Ubuntu including 2 source packages (docker.io, docker.io-app), 14 status rows across 8 suites (bionic, focal, jammy, noble, questing, resolute, upstream, xenial): needs-triage 14. https://ubuntu.com/security/CVE-2026-42306

Affected software / configurations for CVE-2026-42306

Vendor Product Version Raw CPE
docker engine < 29.5.1 cpe:2.3:a:docker:engine:*:*:*:*:*:*:*:*
mobyproject moby <= 28.5.2 cpe:2.3:a:mobyproject:moby:*:*:*:*:*:*:*:*
mobyproject moby\/v2 2.0.0 cpe:2.3:a:mobyproject:moby\/v2:2.0.0:beta0:*:*:*:*:*:*
mobyproject moby\/v2 2.0.0 cpe:2.3:a:mobyproject:moby\/v2:2.0.0:beta1:*:*:*:*:*:*
mobyproject moby\/v2 2.0.0 cpe:2.3:a:mobyproject:moby\/v2:2.0.0:beta10:*:*:*:*:*:*
mobyproject moby\/v2 2.0.0 cpe:2.3:a:mobyproject:moby\/v2:2.0.0:beta11:*:*:*:*:*:*
mobyproject moby\/v2 2.0.0 cpe:2.3:a:mobyproject:moby\/v2:2.0.0:beta12:*:*:*:*:*:*
mobyproject moby\/v2 2.0.0 cpe:2.3:a:mobyproject:moby\/v2:2.0.0:beta13:*:*:*:*:*:*
mobyproject moby\/v2 2.0.0 cpe:2.3:a:mobyproject:moby\/v2:2.0.0:beta2:*:*:*:*:*:*
mobyproject moby\/v2 2.0.0 cpe:2.3:a:mobyproject:moby\/v2:2.0.0:beta3:*:*:*:*:*:*
mobyproject moby\/v2 2.0.0 cpe:2.3:a:mobyproject:moby\/v2:2.0.0:beta4:*:*:*:*:*:*
mobyproject moby\/v2 2.0.0 cpe:2.3:a:mobyproject:moby\/v2:2.0.0:beta5:*:*:*:*:*:*
mobyproject moby\/v2 2.0.0 cpe:2.3:a:mobyproject:moby\/v2:2.0.0:beta6:*:*:*:*:*:*
mobyproject moby\/v2 2.0.0 cpe:2.3:a:mobyproject:moby\/v2:2.0.0:beta7:*:*:*:*:*:*
mobyproject moby\/v2 2.0.0 cpe:2.3:a:mobyproject:moby\/v2:2.0.0:beta8:*:*:*:*:*:*
mobyproject moby\/v2 2.0.0 cpe:2.3:a:mobyproject:moby\/v2:2.0.0:beta9:*:*:*:*:*:*

References for CVE-2026-42306

cvelogic Threat Intelligence