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TI-2026-47475 Aliases CVE-2026-66898

Path traversal via unvalidated instance name in backup tarball restore enables root file write / RCE

Priority HIGH 76CWE-22Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

A path traversal vulnerability in LXD allows an attacker to manipulate file system paths during backup import and restore operations. When importing or restoring a backup archive, LXD fails to validate instance and storage volume names contained within the archive metadata. An attacker can exploit this flaw by supplying a crafted backup archive with malicious instance or volume names containing path traversal sequences, potentially allowing file access or overwriting outside the designated restore directory.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00592 48th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed LXD (Canonical): 4.0.12, 5.0.4, 5.21.2 +1

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
CanonicalLXD4.0.0 to before 4.0.12; 5.0.0 to before 5.0.4; 5.21.0 to before 5.21.2; 6.0 to before 6.14.0.12, 5.0.4, 5.21.2, 6.1Patch availableCNA
  • LXD VendorCanonical Affected 4.0.0 to before 4.0.12; 5.0.0 to before 5.0.4; 5.21.0 to before 5.21.2; 6.0 to before 6.1 Fixed in 4.0.12, 5.0.4, 5.21.2, 6.1 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*4.0.0 to before 4.0.12; 5.0.0 to before 5.0.4; 5.1 to before 5.21.2VulnerableCanonical
cpe:2.3:a:canonical:lxd:6.0:*:*:*:*:*:*:*6.0VulnerableCanonical
  • cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:* Versions 4.0.0 to before 4.0.12; 5.0.0 to before 5.0.4; 5.1 to before 5.21.2 Vulnerable ·Canonical
  • cpe:2.3:a:canonical:lxd:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Canonical

Remediation

  • Fix · CNA LXD (Canonical) Fixed in 4.0.12, 5.0.4, 5.21.2, 6.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-66898

References

Exploit 1

  • TI-2026-22659 Authenticated RCE via unsanitized compression_algorithm CVSS 4.0CRITICAL 9.4
  • TI-2026-45146 Cross-project instance move bypasses all project restrictions allowing host command execution 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