CVE-2026-33743: Incus vulnerable to denial of source through crafted bucket backup file

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-03-26 · updated 2026-06-17
Weakness: CWE-770

Description

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.

Affected products

lxc incus: before 6.23.0 — fixed in 6.23.0

How to fix

Upgrade to a fixed version: lxc incus 6.23.0. Check the vendor advisory for mitigations.

References

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