What is CVE-2026-55621?

CVE-2026-55621 is a high-severity vulnerability in Lxc Incus, classified under Improper Access Control. CVSS score: 7.7/10. Published 2026-08-21.

How severe is CVE-2026-55621?

High severity. CVSS v3 base score is 7.7 out of 10.

Vulnerability in Lxc Incus

CVE-2026-55621

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.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

Affected products

Lxc Incus — versions < 7.2.0

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-55621?: CVE-2026-55621 is a high-severity vulnerability in Lxc Incus, classified under Improper Access Control. CVSS score: 7.7/10. Published 2026-08-21.
How severe is CVE-2026-55621?: High severity. CVSS v3 base score is 7.7 out of 10.