CVE-2026-63297Cross-project instance copy bypasses target project restrictions via TOCTOU in config merge
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 9.9 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- CWE-367, CWE-863
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- canonical
- NVD analysis
- Analyzed
- Record last updated
- Aug 13, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Canonical LXD canonical:lxd (from the name) | from 5.0.0 before 5.0.8; from 5.21.0 before 5.21.6 | CNA record |
canonical lxd canonical:lxd | from 5.0.0 before 5.0.8; from 5.1 before 5.21.6; from 6.0 before 6.9 | NVD |
References
- https://github.com/canonical/lxd/security/advisories/GHSA-v989-qw7w-xvg4vdb-entry, vendor-advisory, exploit, mitigation
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.