Critical
incus — security advisory
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.
- Products
- incus
- Affected versions
- 0.4-1ubuntu1, 0.5.1-1, 0.5.1-3, 0.6-1, 6.0.0-1, 6.0.0-1ubuntu0.1, 6.0.0-1ubuntu0.2, 6.0.0-1ubuntu0.2+esm1, 6.0.0-1ubuntu0.3, 6.0.0-1ubuntu0.3+esm1, 6.0.0-1ubuntu0.3+esm2, 6.0.0-1ubuntu0.3+esm3, 6.0.4-2, 6.0.5-8, 6.0.5-8ubuntu0.26.04.1~esm1, 7.0.1-5
- Fixed versions
- Not specified
- CVEs
- CVE-2026-63343
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:11 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-63343
incus
Fixed versions: Not specified
incus
Fixed versions: Not specified
incus
Fixed versions: Not specified
Complete source record
{
"id": "3abdf8e2f237f9444f511b9bf4e806563bf697b6a0dc34518aa3aa68d388bc51",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-63343",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-63343",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-63343",
"products": [
{
"name": {
"value": "incus",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.4-1ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "0.5.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.5.1-3",
"evidence": "/affected/0/versions"
},
{
"value": "0.6-1",
"evidence": "/affected/0/versions"
},
{
"value": "6.0.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "6.0.0-1ubuntu0.1",
"evidence": "/affected/0/versions"
},
{
"value": "6.0.0-1ubuntu0.2",
"evidence": "/affected/0/versions"
},
{
"value": "6.0.0-1ubuntu0.2+esm1",
"evidence": "/affected/0/versions"
},
{
"value": "6.0.0-1ubuntu0.3",
"evidence": "/affected/0/versions"
},
{
"value": "6.0.0-1ubuntu0.3+esm1",
"evidence": "/affected/0/versions"
},
{
"value": "6.0.0-1ubuntu0.3+esm2",
"evidence": "/affected/0/versions"
},
{
"value": "6.0.0-1ubuntu0.3+esm3",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "incus",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.0.5-8",
"evidence": "/affected/1/versions"
},
{
"value": "7.0.1-5",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "incus",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.0.4-2",
"evidence": "/affected/2/versions"
},
{
"value": "6.0.5-8",
"evidence": "/affected/2/versions"
},
{
"value": "6.0.5-8ubuntu0.26.04.1~esm1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "UBUNTU-CVE-2026-63343",
"aliases": [
"UBUNTU-CVE-2026-63343"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "incus",
"purl": "pkg:deb/ubuntu/incus?arch=source&distro=esm-apps%2Fnoble",
"ecosystem": "Ubuntu:Pro:24.04:LTS"
},
"versions": [
"0.4-1ubuntu1",
"0.5.1-1",
"0.5.1-3",
"0.6-1",
"6.0.0-1",
"6.0.0-1ubuntu0.1",
"6.0.0-1ubuntu0.2",
"6.0.0-1ubuntu0.2+esm1",
"6.0.0-1ubuntu0.3",
"6.0.0-1ubuntu0.3+esm1",
"6.0.0-1ubuntu0.3+esm2",
"6.0.0-1ubuntu0.3+esm3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63343.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "golang-github-lxc-incus-dev",
"binary_version": "6.0.0-1ubuntu0.3+esm3"
},
{
"binary_name": "incus",
"binary_version": "6.0.0-1ubuntu0.3+esm3"
},
{
"binary_name": "incus-agent",
"binary_version": "6.0.0-1ubuntu0.3+esm3"
},
{
"binary_name": "incus-client",
"binary_version": "6.0.0-1ubuntu0.3+esm3"
},
{
"binary_name": "incus-migrate",
"binary_version": "6.0.0-1ubuntu0.3+esm3"
},
{
"binary_name": "incus-tools",
"binary_version": "6.0.0-1ubuntu0.3+esm3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "incus",
"purl": "pkg:deb/ubuntu/incus?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"6.0.5-8",
"7.0.1-5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63343.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "golang-github-lxc-incus-dev",
"binary_version": "7.0.1-5"
},
{
"binary_name": "incus",
"binary_version": "7.0.1-5"
},
{
"binary_name": "incus-agent",
"binary_version": "7.0.1-5"
},
{
"binary_name": "incus-base",
"binary_version": "7.0.1-5"
},
{
"binary_name": "incus-client",
"binary_version": "7.0.1-5"
},
{
"binary_name": "incus-extra",
"binary_version": "7.0.1-5"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "incus",
"purl": "pkg:deb/ubuntu/incus?arch=source&distro=esm-apps%2Fresolute",
"ecosystem": "Ubuntu:Pro:26.04:LTS"
},
"versions": [
"6.0.4-2",
"6.0.5-8",
"6.0.5-8ubuntu0.26.04.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63343.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "golang-github-lxc-incus-dev",
"binary_version": "6.0.5-8ubuntu0.26.04.1~esm1"
},
{
"binary_name": "incus",
"binary_version": "6.0.5-8ubuntu0.26.04.1~esm1"
},
{
"binary_name": "incus-agent",
"binary_version": "6.0.5-8ubuntu0.26.04.1~esm1"
},
{
"binary_name": "incus-base",
"binary_version": "6.0.5-8ubuntu0.26.04.1~esm1"
},
{
"binary_name": "incus-client",
"binary_version": "6.0.5-8ubuntu0.26.04.1~esm1"
},
{
"binary_name": "incus-extra",
"binary_version": "6.0.5-8ubuntu0.26.04.1~esm1"
}
]
}
}
],
"modified": "2026-10-17T13:00:32.192790846Z",
"provider": "osv",
"upstream": [
"CVE-2026-63343"
],
"references": [
"https://ubuntu.com/security/CVE-2026-63343",
"https://www.cve.org/CVERecord?id=CVE-2026-63343",
"https://github.com/lxc/incus/security/advisories/GHSA-fmjx-5j3g-997p",
"https://github.com/lxc/incus/pull/3750"
]
},
"related_cves": [
{
"value": "CVE-2026-63343",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360671,
"published_at": "2026-08-21T15:16:00+00:00"
}