Bug 2531513

Summary: CVE-2026-63343 incus: Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as root [fedora-all]
Product: [Fedora] Fedora Reporter: aedmond
Component: incusAssignee: Neal Gompa <ngompa13>
Status: NEW --- QA Contact:
Severity: urgent Docs Contact:
Priority: urgent    
Version: rawhideCC: dherrera, fabian, go-sig, jonathan, ngompa13, rcallicotte, reto.gantenbein
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["89a9c0de-9580-4580-8be8-0dc10b5aa63c"]}
Fixed In Version: Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
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Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2521024    

Description aedmond 2026-09-10 15:39:28 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.