Vulnerability in Docker Engine
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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.002 (5.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 5.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.091 · newest: 0.002 · change: -0.089
Affected products
- Docker Engine
- Moby — versions < 29.3.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/moby/moby/security/advisories/GHSA-x744-4wpc-v9h2 (Vendor Advisory)
- github.com/moby/moby/releases/tag/docker-v29.3.1 (Release Notes)
Frequently asked questions
- What is CVE-2026-34040?
- CVE-2026-34040 is a high-severity vulnerability in Docker Engine, 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.
- Is CVE-2026-34040 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.