CVE-2026-33542

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

CVE-2026-33542 is fixed in 11 products on 1 platform, first by DEBIAN-CVE-2026-33542, released March 26, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

4.8

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0018

7th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
govulncheck-vulndb · opensuse-leap 16.0	0.0.20260723T184607-160000.1.1	OPENSUSE-SU-2026:21483-1	Jul 30, 2026
incus · Debian 13.5 (trixie)	6.0.4-2+deb13u5	DEBIAN-CVE-2026-33542	Mar 26, 2026
incus · Debian 14	6.0.6-2	DEBIAN-CVE-2026-33542	Mar 26, 2026
incus · Fedora 43	6.23-3.fc43	FEDORA-2026-094B7621CF	Apr 10, 2026
incus-agent · Fedora 43	6.23-3.fc43	FEDORA-2026-094B7621CF	Apr 10, 2026
incus-agent-debuginfo · Fedora 43	6.23-3.fc43	FEDORA-2026-094B7621CF	Apr 10, 2026
incus-client · Fedora 43	6.23-3.fc43	FEDORA-2026-094B7621CF	Apr 10, 2026
incus-client-debuginfo · Fedora 43	6.23-3.fc43	FEDORA-2026-094B7621CF	Apr 10, 2026
incus-debuginfo · Fedora 43	6.23-3.fc43	FEDORA-2026-094B7621CF	Apr 10, 2026
incus-debugsource · Fedora 43	6.23-3.fc43	FEDORA-2026-094B7621CF	Apr 10, 2026
incus-tools · Fedora 43	6.23-3.fc43	FEDORA-2026-094B7621CF	Apr 10, 2026
incus-tools-debuginfo · Fedora 43	6.23-3.fc43	FEDORA-2026-094B7621CF	Apr 10, 2026
lxd · Debian 13.5 (trixie)	5.0.2+git20231211.1364ae4-9+deb13u4	DEBIAN-CVE-2026-33542	Mar 26, 2026

Details

Published
March 26, 2026
Weakness
Improper Certificate Validation
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33542

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