CVE-2026-33542

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

CVSS 5.7 MEDIUMEPSS 0.2%CWE-295

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 5.7EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

26 Mar 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

lxc · incus

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References

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