# CVE-2026-33542: Incus does not verify combined fingerprint when downloading images from simplestreams servers

Source: https://junglewise.ai/threats/cve-2026-33542-incus-does-not-verify-combined-fingerprint-when-downloading  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-07  
License: CC BY 4.0 with a link back

CVE-2026-33542 · Severity: medium · CVSS 4 · Published 2026-04-07

Incus does not verify combined fingerprint when downloading images from simplestreams servers in github.com/lxc/incus

Technologies: [github.com/lxc/incus (Go)](https://junglewise.ai/threats/technologies/github-com-lxc-incus), [github.com/lxc/incus/v6 (Go)](https://junglewise.ai/threats/technologies/github-com-lxc-incus-v6). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2026-33542 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-33542 being exploited in the wild.

**How severe is CVE-2026-33542?** Medium severity, with a CVSS score of 4, published 7 April 2026.

**Which products and versions are affected?** github.com/lxc/incus (Go) SEMVER:introduced=0; github.com/lxc/incus/v6 (Go) SEMVER:introduced=0,fixed=6.23.0; github.com/lxc/incus/v6/client (Go) SEMVER:introduced=0,fixed=6.23.0.

**Is there a fix for CVE-2026-33542?** Yes. github.com/lxc/incus/v6 (Go): upgrade to 6.23.0 or later; github.com/lxc/incus/v6/client (Go): upgrade to 6.23.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2026-33542?** Check whether you run github.com/lxc/incus (Go), github.com/lxc/incus/v6 (Go) or github.com/lxc/incus/v6/client (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/lxc/incus/v6 (Go): upgrade to 6.23.0 or later

  ```sh
  go get github.com/lxc/incus/v6@v6.23.0
  ```

- github.com/lxc/incus/v6/client (Go): upgrade to 6.23.0 or later

  ```sh
  go get github.com/lxc/incus/v6/client@v6.23.0
  ```


## Affected products

- github.com/lxc/incus (Go) SEMVER:introduced=0
- github.com/lxc/incus/v6 (Go) SEMVER:introduced=0,fixed=6.23.0
- github.com/lxc/incus/v6/client (Go) SEMVER:introduced=0,fixed=6.23.0

## Identifiers

- CVE-2026-33542
- GHSA-p8mm-23gg-jc9r
- GO-2026-4882

## Related threats

- [Incus project restriction bypass in instance copy](https://junglewise.ai/threats/cve-2026-55622-incus-project-restriction-bypass-in-instance-copy)
- [Incus authorization bypass in custom volume copy](https://junglewise.ai/threats/cve-2026-55621-incus-authorization-bypass-in-custom-volume-copy)
- [LXC Incus arbitrary file write via image hash path traversal](https://junglewise.ai/threats/cve-2026-48769-lxc-incus-arbitrary-file-write-via-image-hash-path-traversal)
- [LXC Incus nil-pointer dereference in CreateCustomVolumeFromBackup](https://junglewise.ai/threats/cve-2026-48756-lxc-incus-nil-pointer-dereference-in-createcustomvolumefrombackup)
- [LXC Incus argument injection in backup compression algorithm](https://junglewise.ai/threats/cve-2026-48755-lxc-incus-argument-injection-in-backup-compression-algorithm)