Symlink Vulnerability in Incus System Container Manager
CVE-2026-63343

9.9CRITICAL

Key Information:

Vendor

Lxc

Status
Incus
Vendor
CVE Published:
21 August 2026

What is CVE-2026-63343?

Incus, a system container and virtual machine manager, has a vulnerability that allows an authenticated user to create a malicious image with a metadata.yaml symlink pointing to an arbitrary path on the host. This configuration permits the user to read or overwrite files on the host system as root through the instance metadata API. Despite previous patches addressing other paths, the metadata.yaml file remains susceptible to exploitation until updated to version 7.3.0, which resolves this critical issue.

Affected Version(s)

incus < 7.3.0

References

https://github.com/lxc/incus/security/advisories/GHSA-fmj...
x_refsource_CONFIRM

CVSS V3.1

Score:
9.9
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.