CVE-2026-63297: An authorization bypass vulnerability in LXD due to a timing flaw during configuration merging allows an authenticated…
CVE-2026-63297 · Severity: critical · CVSS 9.9 · Published 2026-08-12
An authorization bypass vulnerability in LXD due to a timing flaw during configuration merging allows an authenticated attacker to bypass target project restrictions during cross-project instance copies. When copying an instance to a target project, LXD performs restriction checks before configuration merging is complete, creating a time-of-check to time-of-use (TOCTOU) condition. An attacker can exploit this flaw to copy instances with disallowed high-privilege configurations into restricted projects, bypassing security controls.
No. Junglewise Threat Intelligence has no report of CVE-2026-63297 being exploited in the wild.
How severe is CVE-2026-63297?
Critical severity, with a CVSS score of 9.9, published 12 August 2026.
Which products and versions are affected?
Canonical LXD. The advisory does not name versions.
Is there a fix for CVE-2026-63297?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-63297?
Check whether you run Canonical LXD. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.