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9.9

LXD: Moving instances bypasses project security restrictions

CVE-2026-63300 · published 22 days ago
Summary

An attacker with permission to create instances in one project can move a specially crafted instance to another project, potentially executing arbitrary commands. This can happen if an instance is created in a project with loose restrictions and then moved to a project with stricter restrictions. To mitigate this, ensure that instances are properly validated before moving them between projects.

What to do
  • Update canonical lxd to version 5.0.8 or later.
Affected software
Ecosystem VendorProductAffected versions
– canonical lxd < 5.0.8
Debian:12 debian lxd All versions
Debian:13 debian lxd All versions
Original advisory text
An improper validation vulnerability in the instancePostMigration function in lxd/instance_post.go of LXD allows an authenticated attacker with can_create_instances permissions on a restricted proj...
An improper validation vulnerability in the instancePostMigration function in lxd/instance_post.go of LXD allows an authenticated attacker with can_create_instances permissions on a restricted project to bypass project-level security restrictions. When migrating an instance between projects, LXD fails to validate the instance's configuration against the target project's enforced restrictions (such as restricted.containers.lowlevel, restricted.devices.*, and restricted.networks.access). An attacker can exploit this by creating a disallowed or high-privilege instance in an unrestricted project and subsequently moving it into the restricted project.
References
Severity
9.9 Critical
CVSS 3.1: 9.9 (MITRE)
CVSS 3.1: 9.9 (OSV)
Exploitation
EPSS <1%
Type
CWE-862Missing Authorization
Timeline
Published12 Aug 2026
Updated29 Aug 2026
First seen12 Aug 2026
Sources
DEBIAN-CVE-2026-63300 · OSV
CVE-2026-63300 · NVD
CVE-2026-63300 · MITRE
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