CVE-2026-63343

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Source
https://cve.org/CVERecord?id=CVE-2026-63343
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63343.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-63343
Aliases
  • GHSA-fmjx-5j3g-997p
Downstream
Published
2026-08-21T14:53:26.109Z
Modified
2026-08-23T03:42:42.356148257Z
Severity
  • 9.9 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
Summary
Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as root
Details

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.

Database specific 
{
    "cwe_ids": [
        "CWE-73"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63343.json"
}
References

Affected packages

Git / github.com/lxc/incus

Affected ranges

Type
GIT
Repo
https://github.com/lxc/incus
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
90429bf42f08b41c091e799d81465ff24b5cee2b
Database specific
Show details 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "7.3.0"
        }
    ]
}

Affected versions

v0.*
v0.1.0
v0.2.0
v0.3.0
v0.4.0
v0.5.0
v0.5.1
v0.6.0
v0.7.0
v6.*
v6.0.0
v6.1.0
v6.10.0
v6.10.1
v6.11.0
v6.12.0
v6.13.0
v6.14.0
v6.15.0
v6.16.0
v6.17.0
v6.18.0
v6.19.0
v6.19.1
v6.2.0
v6.20.0
v6.21.0
v6.22.0
v6.23.0
v6.3.0
v6.4.0
v6.5.0
v6.6.0
v6.7.0
v6.8.0
v6.9.0
v7.*
v7.0.0
v7.1.0
v7.2.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63343.json"