# 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.

- Web page: https://patchblox.com/security/cve/CVE-2026-33542
- Priority: Routine
- CVSS: 4.8 (Moderate)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 26, 2026
- Weakness: Improper Certificate Validation
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33542

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | govulncheck-vulndb opensuse-leap 16.0 | 0.0.20260723T184607-160000.1.1 | [OPENSUSE-SU-2026:21483-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21483-1.md) | Jul 30, 2026 |
| Linux | incus Debian 13.5 (trixie) | 6.0.4-2+deb13u5 | [DEBIAN-CVE-2026-33542](https://patchblox.com/security/data/fix/linux/debian-cve-2026-33542.md) | Mar 26, 2026 |
| Linux | incus Debian 14 | 6.0.6-2 | [DEBIAN-CVE-2026-33542](https://patchblox.com/security/data/fix/linux/debian-cve-2026-33542.md) | Mar 26, 2026 |
| Linux | incus Fedora 43 | 6.23-3.fc43 | [FEDORA-2026-094B7621CF](https://patchblox.com/security/data/fix/linux/fedora-2026-094b7621cf.md) | Apr 10, 2026 |
| Linux | incus-agent Fedora 43 | 6.23-3.fc43 | [FEDORA-2026-094B7621CF](https://patchblox.com/security/data/fix/linux/fedora-2026-094b7621cf.md) | Apr 10, 2026 |
| Linux | incus-agent-debuginfo Fedora 43 | 6.23-3.fc43 | [FEDORA-2026-094B7621CF](https://patchblox.com/security/data/fix/linux/fedora-2026-094b7621cf.md) | Apr 10, 2026 |
| Linux | incus-client Fedora 43 | 6.23-3.fc43 | [FEDORA-2026-094B7621CF](https://patchblox.com/security/data/fix/linux/fedora-2026-094b7621cf.md) | Apr 10, 2026 |
| Linux | incus-client-debuginfo Fedora 43 | 6.23-3.fc43 | [FEDORA-2026-094B7621CF](https://patchblox.com/security/data/fix/linux/fedora-2026-094b7621cf.md) | Apr 10, 2026 |
| Linux | incus-debuginfo Fedora 43 | 6.23-3.fc43 | [FEDORA-2026-094B7621CF](https://patchblox.com/security/data/fix/linux/fedora-2026-094b7621cf.md) | Apr 10, 2026 |
| Linux | incus-debugsource Fedora 43 | 6.23-3.fc43 | [FEDORA-2026-094B7621CF](https://patchblox.com/security/data/fix/linux/fedora-2026-094b7621cf.md) | Apr 10, 2026 |
| Linux | incus-tools Fedora 43 | 6.23-3.fc43 | [FEDORA-2026-094B7621CF](https://patchblox.com/security/data/fix/linux/fedora-2026-094b7621cf.md) | Apr 10, 2026 |
| Linux | incus-tools-debuginfo Fedora 43 | 6.23-3.fc43 | [FEDORA-2026-094B7621CF](https://patchblox.com/security/data/fix/linux/fedora-2026-094b7621cf.md) | Apr 10, 2026 |
| Linux | lxd Debian 13.5 (trixie) | 5.0.2+git20231211.1364ae4-9+deb13u4 | [DEBIAN-CVE-2026-33542](https://patchblox.com/security/data/fix/linux/debian-cve-2026-33542.md) | Mar 26, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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