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PatchSiren cyber security CVE debrief

CVE-2026-42306 moby CVE debrief

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.

Vendor
moby
Product
Unknown
CVSS
HIGH 7.2
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-06-16
Advisory published
2026-06-12
Advisory updated
2026-06-16

Who should care

Users of 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.

Technical summary

The vulnerability is caused by a race condition during docker cp mount setup, allowing a malicious container to redirect a bind mount target to an arbitrary host path. This can potentially lead to overwriting host files or causing denial of service.

Defensive priority

HIGH

Recommended defensive actions

  • Update Docker Engine to version 29.5.1 or later
  • Update Moby Daemon to version 2.0.0-beta.14 or later

Evidence notes

CVE-2026-42306 has a CVSS score of 7.2 and is classified as HIGH severity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42306 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42306

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-42306 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42306

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.