CVE-2026-34040
Moby: AuthZ plugin bypass with oversized request body
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.
INFO
Published Date :
March 31, 2026, 3:15 a.m.
Last Modified :
April 3, 2026, 4:51 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update Moby to version 29.3.1 or newer.
- Verify authorization plugin functionality.
- Review Moby security configuration.
Public PoC/Exploit Available at Github
CVE-2026-34040 has a 3 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34040.
| URL | Resource |
|---|---|
| https://github.com/moby/moby/releases/tag/docker-v29.3.1 | Release Notes |
| https://github.com/moby/moby/security/advisories/GHSA-x744-4wpc-v9h2 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34040 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34040
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
to keep up the GitHub contributions
Python
None
Shell HCL
All Public RunWhen Helm Charts - Managed by terraform
Shell Dockerfile Go Template
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34040 vulnerability anywhere in the article.
-
The Hacker News
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The Hacker News
Adobe Patches Actively Exploited Acrobat Reader Flaw CVE-2026-34621
Adobe has released emergency updates to fix a critical security flaw in Acrobat Reader that has come under active exploitation in the wild. The vulnerability, assigned the CVE identifier CVE-2026-3462 ... Read more
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CybersecurityNews
Docker Vulnerability Let Attackers Bypass Authorization and Gain Host Access
A newly discovered high-severity vulnerability in Docker Engine could allow attackers to bypass authorization plugins and potentially gain unauthorized access to the underlying host system. Tracked as ... Read more
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The Hacker News
Docker CVE-2026-34040 Lets Attackers Bypass Authorization and Gain Host Access
A high-severity security vulnerability has been disclosed in Docker Engine that could permit an attacker to bypass authorization plugins (AuthZ) under specific circumstances. The vulnerability, tracke ... Read more
The following table lists the changes that have been made to the
CVE-2026-34040 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 03, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:mobyproject:moby:*:*:*:*:*:*:*:* versions up to (excluding) 29.3.1 Added Reference Type GitHub, Inc.: https://github.com/moby/moby/releases/tag/docker-v29.3.1 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/moby/moby/security/advisories/GHSA-x744-4wpc-v9h2 Types: Vendor Advisory -
New CVE Received by [email protected]
Mar. 31, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Added CWE CWE-288 Added Reference https://github.com/moby/moby/releases/tag/docker-v29.3.1 Added Reference https://github.com/moby/moby/security/advisories/GHSA-x744-4wpc-v9h2