Improper access control in LXD - CVE-2026-63296
Published: August 1, 2026
Vulnerability identifier: #VU140678
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-63296
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code on the host as root.
The vulnerability exists due to improper access control in the instance migration handler when applying user-supplied configuration overrides during cross-member instance migration. A remote user can send a specially crafted instance migration request to execute arbitrary code on the host as root.
Exploitation requires a clustered deployment with 2 or more members and an instance in a restricted project.
Affected software
LXD
How to mitigate CVE-2026-63296
Install security update from vendor's website.
LXD - addressed in versions 5.0.8, 5.21.6, 6.10