CVE-2026-33997

Moby: Off-by-one error in plugin privilege validation

HIGH
8.1
CVSS Score
Published: March 31, 2026 at 01:36 AM UTC
Updated: September 9, 2026 at 01:19 PM UTC
3 products affected across 3 vendorsEngineMulticluster Engine for KubernetesMoby

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Severity
HIGH8.1
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

Moby is an open source container framework. Prior to version 29.3.1, a security vulnerability has been detected that allows plugins privilege validation to be bypassed during docker plugin install. Due to an error in the daemon's privilege comparison logic, the daemon may incorrectly accept a privilege set that differs from the one approved by the user. Plugins that request exactly one privilege are also affected, because no comparison is performed at all. This issue has been patched in version 29.3.1.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 29.3.1
Affected range stops below 29.3.1, so it looks safe — our inference, not a vendor statement
v < 29.3.1
Affected range stops below 29.3.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (8)

x_refsource_CONFIRMVendor Advisory
Source: cverecord
https://github.com/moby/moby/security/advisories/GHSA-pxq6-2prw-chj9
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/moby/moby/releases/tag/docker-v29.3.1
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:21769
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:22347
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:23345
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/security/cve/CVE-2026-33997
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://bugzilla.redhat.com/show_bug.cgi?id=2453277

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-193CWE-266

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