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TI-2026-45146 Aliases CVE-2026-63300

Cross-project instance move bypasses all project restrictions allowing host command execution

Priority HIGH 76CWE-862Published · 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-862.

Summary

An improper validation vulnerability in the instancePostMigration function in lxd/instance_post.go of LXD allows an authenticated attacker with can_create_instances permissions on a restricted project to bypass project-level security restrictions. When migrating an instance between projects, LXD fails to validate the instance's configuration against the target project's enforced restrictions (such as restricted.containers.lowlevel, restricted.devices.*, and restricted.networks.access). An attacker can exploit this by creating a disallowed or high-privilege instance in an unrestricted project and subsequently moving it into the restricted project.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00539 45th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix Fixed LXD (Canonical): 5.0.8, 5.21.6, 6.10

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 5.21.6; 6.0 to before 6.105.0.8, 5.21.6, 6.10Patch availableCNA
  • LXD VendorCanonical Affected 5.0.0 to before 5.0.8; 5.21.0 to before 5.21.6; 6.0 to before 6.10 Fixed in 5.0.8, 5.21.6, 6.10 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 6.10VulnerableCanonical
  • 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 6.10 Vulnerable ·Canonical

Remediation

  • Fix · CNA LXD (Canonical) Fixed in 5.0.8, 5.21.6, 6.10

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Canonical LXD 5.0.8, 5.21.6, 6.10

    4 records Highest priority Priority HIGH 2 HIGH, 2 MEDIUM

    Other records, highest priority first

    • TI-2026-45142 Project restriction bypass via instance migration config overridePriority HIGH 76
    • TI-2026-44537 Cross-project cluster migration bypasses project restrictions via cluster notification flagPriority MEDIUM 44
    • TI-2026-45145 Storage volume cross-project move and snapshot restore bypass project disk limitsPriority MEDIUM 40
    Show all 4 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-63300

References

Exploit 2

Patch 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-2026-45143 Cross-project instance copy bypasses target project restrictions via TOCTOU in config merge 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