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CVE-2026-34040 moby CVE debrief

CVE-2026-34040 is a high-severity security vulnerability in Moby, an open-source container framework. The vulnerability, which has a CVSS score of 8.8, allows attackers to bypass authorization plugins (AuthZ). This issue was patched in version 29.3.1 of Moby.

Vendor
moby
Product
Unknown
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-03-31
Original CVE updated
2026-06-16
Advisory published
2026-03-31
Advisory updated
2026-06-16

Who should care

Users of Moby, particularly those who utilize authorization plugins (AuthZ), should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The vulnerability, which has been assigned a CVSS score of 8.8, allows attackers to bypass authorization plugins (AuthZ) in Moby. This issue was detected prior to version 29.3.1 of Moby.

Defensive priority

HIGH

Recommended defensive actions

  • Upgrade to version 29.3.1 of Moby to patch the vulnerability.
  • Review and update authorization plugins (AuthZ) to ensure they are properly configured.

Evidence notes

The vulnerability was patched in version 29.3.1 of Moby. For more information, see [ref-4](https://github.com/moby/moby/releases/tag/docker-v29.3.1) and [ref-5](https://github.com/moby/moby/security/advisories/GHSA-x744-4wpc-v9h2).

Official resources

CVE-2026-34040 was published on [cvePublishedAt]. The CVE was modified on [cveModifiedAt].