What is CVE-2026-33542?

CVE-2026-33542 is a medium-severity vulnerability in Linuxcontainers Incus, classified under Improper Certificate Validation. CVSS score: 4.8/10. Published 2026-03-26.

How severe is CVE-2026-33542?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Linuxcontainers Incus

CVE-2026-33542

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.

Vulnerability class: Improper Certificate Validation

Published 2026-03-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (8.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 8.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Linuxcontainers Incus
Lxc Incus — versions < 6.23.0

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

github.com/lxc/incus/security/advisories/GHSA-p8mm-23gg-jc9r (Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33542?: CVE-2026-33542 is a medium-severity vulnerability in Linuxcontainers Incus, classified under Improper Certificate Validation. CVSS score: 4.8/10. Published 2026-03-26.
How severe is CVE-2026-33542?: Medium severity. CVSS v3 base score is 4.8 out of 10.