CVE-2026-34040

Engine vulnerability

CVSS

8.8

EPSS

8.1%

EPSS pct

94th

Exploited

No known

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 vendor

Docker

Affected product

Engine

CVSS vector

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

Weakness type (CWE)

CWE-288 — Authentication Bypass Using an Alternate Path

Published

2026-03-31

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable with local access, low attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 8.1% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 94% of all scored CVEs.

Check your external exposure to CVE-2026-34040

Confirm whether Docker Engine is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2026-34040.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2026-34040

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