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CVE-2026-34040

HighPublished

Moby: AuthZ plugin bypass with oversized request body

Published: Mar 31, 2026
Updated: Apr 2, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 8, 2026

Primary CVSS

8.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS probability estimate

9.1%

Low · next 30 days

Percentile: 95.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Moby is an open source container framework. Prior to version 29.3.1, a security vulnerability has been detected that allows attackers to bypass authorization plugins (AuthZ). This issue has been patched in version 29.3.1.

Sources

CVE-2026-34040-PoCPoC
Lab reproduction of CVE-2026-34040: bypasses Docker/Moby AuthZ plugins using oversized (>1MB) request bodies to create privileged containers with host access.

Responsible use

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