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Vulnerabilities CVE-2026-63297

CVE-2026-63297

Critical
Open
TLP:CLEAR

Cross-project instance copy bypasses target project restrictions via TOCTOU in config merge

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Description

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.

Details

CVSS Score
9.9
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Confidence
90%
Published
Aug 12, 2026
Last Modified
Aug 12, 2026
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