Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as root (CVE-2026-63293) | HOL Guard CVE

Critical · CVSS 9.9CVE-2026-63293

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

Answer in brief

CVE-2026-63293 records a Critical severity (CVSS 9.9) vulnerability in Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as root. The current sources do not mark it as known exploited. The current feed maps Canonical/LXD (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 12, 2026Updated Sep 3, 2026Source checked Sep 28, 2026First seen by HOL Aug 12, 2026Material review Sep 3, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.9
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 9.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Canonical/LXD (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:a:canonical:lxd::::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Canonical/LXDgeneric	>=4.0.0 <4.0.12 \|\| >=5.0.0 <5.0.8 \|\| >=5.21.0 <5.21.6 \|\| >=6.0 <6.10	4.0.12, 5.0.8, 5.21.6, 6.10

Recommended response

Check inventory. Check lockfiles and deployed manifests for Canonical/LXD.
Review the reported fix. Update Canonical/LXD to 4.0.12 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 12, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 3, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 12, 2026

Sources and claim methodology

GitHub security advisorygithub.com

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.