{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-63297", "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "state": "PUBLISHED", "assignerShortName": "canonical", "dateReserved": "2026-07-16T09:49:29.911Z", "datePublished": "2026-08-12T19:25:24.420Z", "dateUpdated": "2026-08-12T19:25:24.420Z"}, "containers": {"cna": {"title": "Cross-project instance copy bypasses target project restrictions via TOCTOU in config merge", "descriptions": [{"lang": "en", "value": "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": [{"vendor": "Canonical", "product": "LXD", "packageName": "LXD", "platforms": ["Linux"], "repo": "https://github.com/canonical/lxd", "defaultStatus": "unaffected", "versions": [{"version": "5.0.0", "status": "affected", "versionType": "semver", "lessThan": "5.0.8"}, {"version": "5.21.0", "status": "affected", "versionType": "semver", "lessThan": "5.21.6"}]}], "problemTypes": [{"descriptions": [{"type": "CWE", "lang": "en", "description": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition", "cweId": "CWE-367"}, {"type": "CWE", "lang": "en", "description": "CWE-863 Incorrect Authorization", "cweId": "CWE-863"}]}], "impacts": [{"capecId": "CAPEC-1", "descriptions": [{"lang": "en", "value": "Accessing Functionality Not Properly Constrained by ACLs"}]}, {"capecId": "CAPEC-122", "descriptions": [{"lang": "en", "value": "Privilege Abuse"}]}, {"capecId": "CAPEC-233", "descriptions": [{"lang": "en", "value": "Privilege Escalation"}]}], "references": [{"url": "https://github.com/canonical/lxd/security/advisories/GHSA-v989-qw7w-xvg4", "tags": ["vdb-entry", "vendor-advisory"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseScore": 9.9, "baseSeverity": "CRITICAL"}}], "source": {"discovery": "EXTERNAL"}, "solutions": [{"lang": "en", "value": "Upgrade to LXD version 5.0.8 or later, or 5.12.6 or later."}], "providerMetadata": {"orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "shortName": "canonical", "dateUpdated": "2026-08-12T19:25:24.420Z"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "packageName": "LXD", "platforms": ["Linux"], "product": "LXD", "repo": "https://github.com/canonical/lxd", "vendor": "Canonical", "versions": [{"lessThan": "5.0.8", "status": "affected", "version": "5.0.0", "versionType": "semver"}, {"lessThan": "5.21.6", "status": "affected", "version": "5.21.0", "versionType": "semver"}]}], "source": "security@ubuntu.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-63297", "lastModified": "2026-08-12T20:17:47.583", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.9, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.1, "impactScore": 6.0, "source": "security@ubuntu.com", "type": "Secondary"}]}, "published": "2026-08-12T20:17:47.583", "references": [{"source": "security@ubuntu.com", "url": "https://github.com/canonical/lxd/security/advisories/GHSA-v989-qw7w-xvg4"}], "sourceIdentifier": "security@ubuntu.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-367"}, {"lang": "en", "value": "CWE-863"}], "source": "security@ubuntu.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["linux"], "status": "affected", "versions": {"scheme": "semver", "value": "[5.0.0,5.0.8)"}}, {"platform": ["linux"], "status": "affected", "versions": {"scheme": "semver", "value": "[5.21.0,5.21.6)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "LXD", "source": "cna", "vendor": "Canonical"}, "product": "lxd", "vendor": "canonical"}], "created": "2026-08-12T20:45:08.711245+00:00", "updated": "2026-08-12T20:45:08.711263+00:00", "vendors": ["canonical", "canonical$PRODUCT$lxd"]}