Auth bypass in Lxc Incus
CVE-2026-62941
Incus is a system container and virtual machine manager. Prior to version 7.3.0, when copying an instance across projects, the project restriction check (`AllowInstanceCreation`) runs BEFORE the source instance's configuration is merged into the request. Dangerous configuration keys (including `security.privileged`, `raw.lxc`, `raw.apparmor`) from the source instance are merged AFTER the check passes, bypassing all project restrictions on the target project. Version 7.3.0 patches the issue.
Vulnerability class: Broken Access Control
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Lxc Incus — versions < 7.3.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-62941?
- CVE-2026-62941 is a critical-severity vulnerability in Lxc Incus, classified under Incorrect Authorization. CVSS score: 9.9/10. Published 2026-08-21.
- How severe is CVE-2026-62941?
- Critical severity. CVSS v3 base score is 9.9 out of 10.