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CVE-2026-34040

40
FAUCET Score

CVE-2026-34040 is a high-severity vulnerability affecting Moby, an open-source container framework, in versions prior to 29.3.1, which allows attackers to bypass authorization plugins (AuthZ). With a CVSS score of 7.8 (High), this flaw has a low attack complexity and can result in high impact across confidentiality, integrity, and availability. There is currently no evidence of active exploitation, exploit code availability (Metasploit, Nuclei, ExploitDB), or inclusion in the KEV catalog, though it has received some community attention.

Impacted Technologies

VendorProductVersion(s)CPE
< 29.3.1CPE matchmatch criteria
cpe:2.3:a:docker:engine:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.0
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
10.14%
Probability of exploitation in next 30 days
EPSS Percentile
95.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.1014 is in the 99th percentile among its peer group of 16,994 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

gopatch availablevia ghsa
Product: github.com/moby/mobyFixed in: 29.3.1
gopatch availablevia ghsa
Product: github.com/docker/dockerFixed in: 29.3.1
gopatch availablevia ghsa
Product: github.com/moby/moby/v2Fixed in: 2.0.0-beta.8
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

goGHSA-x744-4wpc-v9h2high

Moby has AuthZ plugin bypass when provided oversized request bodies

Mar 27, 2026

References

github.com / moby/moby/releases/tag/docker-v29.3.1
Release Notes
github.com / moby/moby/security/advisories/GHSA-x744-4wpc-v9h2
Vendor Advisory