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PatchSiren cyber security CVE debrief

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).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-34040 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-34040

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

  • CVE-2026-34040 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-34040

    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.