ubuntu-cve-2026-33897
Vulnerability from osv_ubuntu
Published
2026-03-26 23:16
Modified
2026-07-02 16:13
Summary
Details
Incus is a system container and virtual machine manager. Prior to version 6.23.0, instance template files can be used to cause arbitrary read or writes as root on the host server. Incus allows for pongo2 templates within instances which can be used at various times in the instance lifecycle to template files inside of the instance. This particular implementation of pongo2 within Incus allowed for file read/write but with the expectation that the pongo2 chroot feature would isolate all such access to the instance's filesystem. This was allowed such that a template could theoretically read a file and then generate a new version of said file. Unfortunately the chroot isolation mechanism is entirely skipped by pongo2 leading to easy access to the entire system's filesystem with root privileges. Version 6.23.0 patches the issue.
Severity
9.9 (Critical)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "golang-github-lxc-lxd-dev",
"binary_version": "2.0.11-0ubuntu1~16.04.4+esm3"
},
{
"binary_name": "lxc2",
"binary_version": "2.0.11-0ubuntu1~16.04.4+esm3"
},
{
"binary_name": "lxd",
"binary_version": "2.0.11-0ubuntu1~16.04.4+esm3"
},
{
"binary_name": "lxd-client",
"binary_version": "2.0.11-0ubuntu1~16.04.4+esm3"
},
{
"binary_name": "lxd-tools",
"binary_version": "2.0.11-0ubuntu1~16.04.4+esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "lxd",
"purl": "pkg:deb/ubuntu/lxd@2.0.11-0ubuntu1~16.04.4+esm3?arch=source\u0026distro=esm-infra-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.20-0ubuntu4",
"0.21-0ubuntu3",
"0.21-0ubuntu5",
"0.22-0ubuntu1",
"0.22-0ubuntu2",
"0.23-0ubuntu1",
"0.23-0ubuntu2",
"0.23-0ubuntu3",
"0.24-0ubuntu2",
"0.24-0ubuntu3",
"0.24-0ubuntu4",
"0.25-0ubuntu1",
"0.26-0ubuntu2",
"0.26-0ubuntu3",
"0.27-0ubuntu1",
"0.27-0ubuntu2",
"2.0.0~beta1-0ubuntu3",
"2.0.0~beta1-0ubuntu4",
"2.0.0~beta2-0ubuntu1",
"2.0.0~beta2-0ubuntu2",
"2.0.0~beta3-0ubuntu1",
"2.0.0~beta3-0ubuntu2",
"2.0.0~beta3-0ubuntu3",
"2.0.0~beta3-0ubuntu4",
"2.0.0~beta4-0ubuntu1",
"2.0.0~beta4-0ubuntu2",
"2.0.0~beta4-0ubuntu3",
"2.0.0~beta4-0ubuntu4",
"2.0.0~beta4-0ubuntu5",
"2.0.0~beta4-0ubuntu6",
"2.0.0~beta4-0ubuntu7",
"2.0.0~rc1-0ubuntu1",
"2.0.0~rc1-0ubuntu2",
"2.0.0~rc1-0ubuntu3",
"2.0.0~rc2-0ubuntu2",
"2.0.0~rc2-0ubuntu3",
"2.0.0~rc3-0ubuntu1",
"2.0.0~rc3-0ubuntu2",
"2.0.0~rc3-0ubuntu3",
"2.0.0~rc3-0ubuntu4",
"2.0.0~rc4-0ubuntu1",
"2.0.0~rc5-0ubuntu1",
"2.0.0~rc6-0ubuntu1",
"2.0.0~rc6-0ubuntu2",
"2.0.0~rc7-0ubuntu1",
"2.0.0~rc7-0ubuntu2",
"2.0.0~rc8-0ubuntu1",
"2.0.0~rc8-0ubuntu2",
"2.0.0~rc8-0ubuntu3",
"2.0.0~rc8-0ubuntu5",
"2.0.0~rc8-0ubuntu6",
"2.0.0~rc8-0ubuntu7",
"2.0.0~rc9-0ubuntu2",
"2.0.0~rc9-0ubuntu3",
"2.0.0~rc9-0ubuntu4",
"2.0.0~rc9-0ubuntu5",
"2.0.0-0ubuntu1",
"2.0.0-0ubuntu2",
"2.0.0-0ubuntu3",
"2.0.0-0ubuntu4",
"2.0.1-0ubuntu1~16.04.1",
"2.0.2-0ubuntu1~16.04.1",
"2.0.3-0ubuntu1~ubuntu16.04.2",
"2.0.4-0ubuntu1~ubuntu16.04.1",
"2.0.5-0ubuntu1~ubuntu16.04.1",
"2.0.8-0ubuntu1~ubuntu16.04.1",
"2.0.8-0ubuntu1~ubuntu16.04.2",
"2.0.9-0ubuntu1~16.04.1",
"2.0.9-0ubuntu1~16.04.2",
"2.0.10-0ubuntu1~16.04.1",
"2.0.10-0ubuntu1~16.04.2",
"2.0.11-0ubuntu1~16.04.2",
"2.0.11-0ubuntu1~16.04.4",
"2.0.11-0ubuntu1~16.04.4+esm1",
"2.0.11-0ubuntu1~16.04.4+esm2",
"2.0.11-0ubuntu1~16.04.4+esm3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "lxd",
"binary_version": "3.0.3-0ubuntu1~18.04.2+esm3"
},
{
"binary_name": "lxd-client",
"binary_version": "3.0.3-0ubuntu1~18.04.2+esm3"
},
{
"binary_name": "lxd-tools",
"binary_version": "3.0.3-0ubuntu1~18.04.2+esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "lxd",
"purl": "pkg:deb/ubuntu/lxd@3.0.3-0ubuntu1~18.04.2+esm3?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.18-0ubuntu6",
"2.19-0ubuntu1",
"2.20-0ubuntu3",
"2.20-0ubuntu4",
"2.21-0ubuntu1",
"2.21-0ubuntu2",
"2.21-0ubuntu3",
"2.21-0ubuntu4",
"3.0.0~beta2-0ubuntu3",
"3.0.0~beta3-0ubuntu3",
"3.0.0~beta5-0ubuntu2",
"3.0.0~beta7-0ubuntu1",
"3.0.0-0ubuntu1",
"3.0.0-0ubuntu2",
"3.0.0-0ubuntu3",
"3.0.0-0ubuntu4",
"3.0.1-0ubuntu1~18.04.1",
"3.0.2-0ubuntu1~18.04.1",
"3.0.3-0ubuntu1~18.04.1",
"3.0.3-0ubuntu1~18.04.2",
"3.0.3-0ubuntu1~18.04.2+esm1",
"3.0.3-0ubuntu1~18.04.2+esm2",
"3.0.3-0ubuntu1~18.04.2+esm3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "lxd",
"binary_version": "1:0.10"
},
{
"binary_name": "lxd-client",
"binary_version": "1:0.10"
},
{
"binary_name": "lxd-tools",
"binary_version": "1:0.10"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "lxd",
"purl": "pkg:deb/ubuntu/lxd@1:0.10?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:0.7",
"1:0.8",
"1:0.9",
"1:0.10"
]
},
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:24.04:LTS",
"name": "incus",
"purl": "pkg:deb/ubuntu/incus@6.0.0-1ubuntu0.3+esm3?arch=source\u0026distro=esm-apps/noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "golang-github-lxc-incus-dev",
"binary_version": "6.0.4-2"
},
{
"binary_name": "incus",
"binary_version": "6.0.4-2"
},
{
"binary_name": "incus-agent",
"binary_version": "6.0.4-2"
},
{
"binary_name": "incus-base",
"binary_version": "6.0.4-2"
},
{
"binary_name": "incus-client",
"binary_version": "6.0.4-2"
},
{
"binary_name": "incus-extra",
"binary_version": "6.0.4-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "incus",
"purl": "pkg:deb/ubuntu/incus@6.0.4-2?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"6.0.3-4",
"6.0.4-2"
]
},
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:26.04:LTS",
"name": "incus",
"purl": "pkg:deb/ubuntu/incus@6.0.5-8ubuntu0.26.04.1~esm1?arch=source\u0026distro=esm-apps/resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"6.0.4-2",
"6.0.5-8",
"6.0.5-8ubuntu0.26.04.1~esm1"
]
}
],
"aliases": [],
"details": "Incus is a system container and virtual machine manager. Prior to version 6.23.0, instance template files can be used to cause arbitrary read or writes as root on the host server. Incus allows for pongo2 templates within instances which can be used at various times in the instance lifecycle to template files inside of the instance. This particular implementation of pongo2 within Incus allowed for file read/write but with the expectation that the pongo2 chroot feature would isolate all such access to the instance\u0027s filesystem. This was allowed such that a template could theoretically read a file and then generate a new version of said file. Unfortunately the chroot isolation mechanism is entirely skipped by pongo2 leading to easy access to the entire system\u0027s filesystem with root privileges. Version 6.23.0 patches the issue.",
"id": "UBUNTU-CVE-2026-33897",
"modified": "2026-07-02T16:13:28Z",
"published": "2026-03-26T23:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-33897"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-33897"
},
{
"type": "REPORT",
"url": "https://github.com/lxc/incus/pull/3092"
},
{
"type": "REPORT",
"url": "https://github.com/lxc/incus/security/advisories/GHSA-83xr-5xxr-mh92"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-33897"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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