CVE-2026-33542

Incus does not verify combined fingerprint when downloading images from simplestreams servers

State: Published
Severity: 5.7 Medium
Published: Mar 26, 2026
Updated: Mar 30, 2026
Reserved: Mar 20, 2026

Description

Incus is a system container and virtual machine manager. Prior to version 6.23.0, a lack of validation of the image fingerprint when downloading from simplestreams image servers opens the door to image cache poisoning and under very narrow circumstances exposes other tenants to running attacker controlled images rather than the expected one. Version 6.23.0 patches the issue.

Scores

CVSS	Score	Vector	Source
4.0	5.7 Medium	CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N/E:P	GitHub_M

Weaknesses

CWE-295 Improper Certificate Validation

Affected Products

Product	Versions
incuslxc	< 6.23.0Affected

References

https://github.com/lxc/incus/security/advisories/GHSA-p8mm-23gg-jc9r

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