CVE-2026-55621 Incus has a project restriction bypass for custom volume copy across projects
Attackers can bypass project restrictions to copy custom volumes from unauthorized projects, potentially exposing sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-55621?
CVE-2026-55621 is a high-severity missing authorization vulnerability in lxc incus, published on 21 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Incus is a system container and virtual machine manager. Prior to version 7.2.0, missing authorization checks exist for custom volume copying where an attacker knowing the name of a project that they don't have access to and the name of a custom volume in that project can copy the custom volume to a new project. This issue could allow an attacker to access secrets in custom volumes they are not authorized to access. Version 7.2.0 patches the issue.
Weakness: CWE-284
Which versions are affected by CVE-2026-55621?
9 open source packages ship an affected version, including github.com/lxc/incus, github.com/lxc/incus/v6 and github.com/lxc/incus/v7.
| Package | Affected | Fixed in |
|---|---|---|
github.com/lxc/incus Go | All versions | None |
github.com/lxc/incus Go | All versions to 0.7.0 | None |
github.com/lxc/incus Go | All versions to 0.7.0 | None |
github.com/lxc/incus/v6 Go | All versions | None |
github.com/lxc/incus/v6 Go | All versions to 6.23.0 | None |
github.com/lxc/incus/v6 Go | All versions to 6.23.0 | None |
3 more packages
github.com/lxc/incus/v7 Go | All versions | 7.2.0 |
github.com/lxc/incus/v7 Go | All versions | 7.2.0 |
github.com/lxc/incus/v7 Go | All versions | 7.2.0 |
How do I fix CVE-2026-55621?
Upgrade to a fixed version.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-55621 being exploited?
There is no known exploitation of CVE-2026-55621 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-55621, GHSA-64f3-v33m-w89f, GO-2026-6318, UBUNTU-CVE-2026-55621.