lxc incus up to 6.22.x Control Plane API allocation of resources

Summaryinfo

A vulnerability was found in lxc incus up to 6.22.x. It has been declared as problematic. The impacted element is an unknown function of the component Control Plane API. Executing a manipulation can lead to allocation of resources. This vulnerability is registered as CVE-2026-33743. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in lxc incus up to 6.22.x. This vulnerability affects some unknown processing of the component Control Plane API. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. As an impact it is known to affect availability. CVE summarizes:

Incus is a system container and virtual machine manager. Prior to version 6.23.0, a specially crafted storage bucket backup can be used by an user with access to Incus' storage bucket feature to crash the Incus daemon. Repeated use of this attack can be used to keep the server offline causing a denial of service of the control plane API. This does not impact any running workload, existing containers and virtual machines will keep operating. Version 6.23.0 fixes the issue.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-33743 since 03/23/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 304243 (Debian dsa-6184 : golang-github-lxc-incus-dev - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.23.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (304243). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• lxc

Name

• incus

Version

• 6.0
• 6.1
• 6.2
• 6.3
• 6.4
• 6.5
• 6.6
• 6.7
• 6.8
• 6.9
• 6.10
• 6.11
• 6.12
• 6.13
• 6.14
• 6.15
• 6.16
• 6.17
• 6.18
• 6.19
• 6.20
• 6.21
• 6.22

Website

• Product: https://github.com/lxc/incus/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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