CVSS 9.9 (critical) · 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.
Affected products (NVD): canonical lxd
Fixed in (NVD): 5.0.8, 5.21.6, 6.9
Weakness: CWE-367, CWE-863
Source: NVD CVE-2026-63297
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