Improper Validation Issue in LXD by Canonical
CVE-2026-63300

9.9CRITICAL

Key Information:

Vendor

Canonical

Status
Lxd
Vendor
CVE Published:
12 August 2026

What is CVE-2026-63300?

An improper validation vulnerability exists in the instancePostMigration function of LXD, where an authenticated attacker with specific permissions can bypass critical project-level security restrictions. This vulnerability allows malicious actors to migrate instances between projects without proper validation of the instance's configuration against the enforced restrictions of the target project, potentially leading to unauthorized access and elevated privileges.

Affected Version(s)

LXD Linux 5.0.0 < 5.0.8

LXD Linux 5.21.0 < 5.21.6

LXD Linux 6.0 < 6.10

References

https://github.com/canonical/lxd/security/advisories/GHSA...
vdb-entryvendor-advisory
https://github.com/canonical/lxd/pull/18651
patch
https://github.com/canonical/lxd/pull/18605
patch

CVSS V3.1

Score:
9.9
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.