CVE-2026-63293 PUBLISHED

Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as root

Assigner: canonical
Reserved: 16.07.2026 Published: 12.08.2026 Updated: 13.08.2026

A link following vulnerability in LXD allows an attacker to achieve arbitrary file read and write operations on the host system. When importing or unpacking an image archive, LXD fails to validate whether the metadata.yaml file is a symbolic link. An attacker can exploit this flaw by providing a crafted image archive with a symlinked metadata.yaml file pointing to target file paths on the host system.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS Score: 9.9

Product Status

Vendor Canonical
Product LXD
Versions Default: unaffected
  • affected from 4.0.0 to 4.0.12 (excl.)
  • affected from 5.0.0 to 5.0.8 (excl.)
  • affected from 5.21.0 to 5.21.6 (excl.)
  • affected from 6.0 to 6.10 (excl.)

Solutions

Upgrade to LXD version 4.0.12 or later, 5.0.8 or later, or 5.12.6 or later, or 6.10 or later.

References

Problem Types

  • CWE-59 Improper Link Resolution Before File Access ('Link Following') CWE

Impacts

  • Symlink Attack
  • Input Data Manipulation