{"id":"CVE-2026-63297","title":"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","summary":"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 tar…","severity":"critical","cvss":9.9,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","cwe":["CWE-367","CWE-863"],"vendor":"canonical","product":"lxd","affected":["lxd >= 5.0.0, < 5.0.8","lxd >= 5.1, < 5.21.6","lxd >= 6.0, < 6.9"],"patched":["lxd 6.9"],"published":"2026-08-12","updated":"2026-09-11","sourceUpdated":"2026-09-11T15:18:18.907","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-63297","references":[{"url":"https://github.com/canonical/lxd/security/advisories/GHSA-v989-qw7w-xvg4","label":"security@ubuntu.com"},{"url":"https://github.com/canonical/lxd/security/advisories/GHSA-v989-qw7w-xvg4","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-08-13T14:28:52.383092Z"},"ingestedAt":"2026-09-13T11:28:38.759Z","epss":0.0024,"epssPercentile":0.15352,"slug":"CVE-2026-63297","body":"## Overview\n\nAn 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.\n\n## Affected\n\n- `lxd >= 5.0.0, < 5.0.8`\n- `lxd >= 5.1, < 5.21.6`\n- `lxd >= 6.0, < 6.9`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `lxd 6.9`","depth":"abyssal","depthScore":66,"depthScoreParts":{"impact":54.5,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[]}