What is CVE-2026-34040?

CVE-2026-34040 is a high-severity vulnerability in Moby, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 8.8/10. Published 2026-03-31.

How severe is CVE-2026-34040?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Moby

CVE-2026-34040

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.

EPSS: 0.000 (0.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Moby — versions < 29.3.1

Weakness classification (CWE)

CWE-288 — Authentication Bypass Using an Alternate Path or Channel

References

https://github.com/moby/moby/security/advisories/GHSA-x744-4wpc-v9h2 (x_refsource_CONFIRM)
https://github.com/moby/moby/releases/tag/docker-v29.3.1 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-34040?: CVE-2026-34040 is a high-severity vulnerability in Moby, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 8.8/10. Published 2026-03-31.
How severe is CVE-2026-34040?: High severity. CVSS v3 base score is 8.8 out of 10.