UBUNTU-CVE-2026-55621 (CVE-2026-55621)
Vulnerability from osv_ubuntu – Published: 2026-08-21 15:16 – Updated: 2026-09-02 16:20 – Source website
VLAI
Details
Incus is a system container and virtual machine manager. Prior to version 7.2.0, missing authorization checks exist for custom volume copying where an attacker knowing the name of a project that they don't have access to and the name of a custom volume in that project can copy the custom volume to a new project. This issue could allow an attacker to access secrets in custom volumes they are not authorized to access. Version 7.2.0 patches the issue.
Severity
7.7 (High)
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 7.2.0, missing authorization checks exist for custom volume copying where an attacker knowing the name of a project that they don\u0027t have access to and the name of a custom volume in that project can copy the custom volume to a new project. This issue could allow an attacker to access secrets in custom volumes they are not authorized to access. Version 7.2.0 patches the issue.",
"id": "UBUNTU-CVE-2026-55621",
"modified": "2026-09-02T16:20:01Z",
"published": "2026-08-21T15:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-55621"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-55621"
},
{
"type": "REPORT",
"url": "https://github.com/lxc/incus/security/advisories/GHSA-64f3-v33m-w89f"
},
{
"type": "REPORT",
"url": "https://github.com/lxc/incus/commit/2e01078366e2653712719dec82318e51c6d21b28"
},
{
"type": "REPORT",
"url": "https://github.com/canonical/lxd/pull/18603"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-55621"
]
}
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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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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