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TI-2026-45143 Aliases CVE-2026-63297

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

Priority HIGH 76CWE-367Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-863.

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 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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00343 28th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed LXD (Canonical): 5.0.8, 5.21.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CanonicalLXD5.0.0 to before 5.0.8; 5.21.0 to before 5.21.65.0.8, 5.21.6Patch availableCNA
  • LXD VendorCanonical Affected 5.0.0 to before 5.0.8; 5.21.0 to before 5.21.6 Fixed in 5.0.8, 5.21.6 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*5.0.0 to before 5.0.8; 5.1 to before 5.21.6; 6.0 to before 6.9VulnerableCanonical
  • cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:* Versions 5.0.0 to before 5.0.8; 5.1 to before 5.21.6; 6.0 to before 6.9 Vulnerable ·Canonical

Remediation

  • Fix · CNA LXD (Canonical) Fixed in 5.0.8, 5.21.6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-63297

References

Exploit 1

  • TI-2026-22659 Authenticated RCE via unsanitized compression_algorithm CVSS 4.0CRITICAL 9.4
  • TI-2026-47475 Path traversal via unvalidated instance name in backup tarball restore enables root file write / RCE CVSS 3.1CRITICAL 9.9
  • TI-2026-45146 Cross-project instance move bypasses all project restrictions allowing host command execution CVSS 3.1CRITICAL 9.9
  • TI-2026-45142 Project restriction bypass via instance migration config override CVSS 3.1CRITICAL 9.9
  • TI-2026-45140 Root RCE via image backup.yaml symlink CVSS 3.1CRITICAL 9.9
  • TI-2026-45139 Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as root CVSS 3.1CRITICAL 9.9
See all 34 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences