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Untriaged
Permalink CVE-2026-63343
9.9 CRITICAL
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Network (N)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): Low (L)
  • User Interaction (UI): None (N)
  • Scope (S): Changed (C)
  • Confidentiality (C): High (H)
  • Integrity (I): High (H)
  • Availability (A): High (H)
  • Modified Attack Vector (MAV): Network (N)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): Low (L)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): High (H)
  • Modified Scope (MS): Changed (C)
  • Modified Integrity (MI): High (H)
  • Modified Availability (MA): High (H)
created 3 weeks, 4 days ago Activity log
  • Created suggestion 3 weeks, 4 days ago
Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as root

Incus is a system container and virtual machine manager. Prior to version 7.3.0, a malicious image containing a `metadata.yaml` symlink pointing to an arbitrary host path allows an authenticated Incus user to read or overwrite any file on the host as root via the instance metadata API. The `exec-output` and `templates/` paths were patched in a prior release using `Lstat` rejection and `os.OpenRoot` confinement; `metadata.yaml` was not included in either patch and remains exploitable. Version 7.3.0 patches the issue.

Affected products

incus
  • ==< 7.3.0

Matching in nixpkgs

pkgs.incus

Powerful system container and virtual machine manager

pkgs.incus-lts

Powerful system container and virtual machine manager

pkgs.incus-spawn

CLI tool for managing isolated Incus development environments

  • nixos-unstable -

pkgs.incus-compose

Bring the familiar Docker Compose workflow to Incus — run compose.yaml files natively on Incus

  • nixos-unstable -
    • nixos-unstable-small 1.2.0

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