CVE-2026-63297 — Cross-project instance copy bypasses target project restrictions via TOCTOU in config merge
An authorization bypass vulnerability in LXD due to a timing flaw during configuration merging allows an authenticated attacker to bypass target project restrictions during cros…
Published: 2026-08-12 · CVSS: 9.9 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7