CVE-2026-34040

Moby: AuthZ plugin bypass with oversized request body

HIGH

7.8

CVSS Score

Published: March 31, 2026 at 01:36 AM UTC

Updated: June 17, 2026 at 10:38 AM UTC

2 products affected across 2 vendorsEngineMoby

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Severity

HIGH7.8

Exploit prediction

EPSS 9%

SSVC

No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Engine · Docker

95%

v < 29.3.1

Affected range stops below 29.3.1, so it looks safe — our inference, not a vendor statement

Moby · Moby

60%

v < 29.3.1

Affected range stops below 29.3.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://github.com/moby/moby/security/advisories/GHSA-x744-4wpc-v9h2

References (2)

x_refsource_CONFIRMVendor Advisory

Source: cverecord

https://github.com/moby/moby/security/advisories/GHSA-x744-4wpc-v9h2

x_refsource_MISCRelease Notes

Source: cverecord

https://github.com/moby/moby/releases/tag/docker-v29.3.1

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGH[email protected]

Attack Vector: LOCAL
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-288

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