CVE-2026-62313
Incus: Project restriction `restricted.containers.privilege=isolated` bypassable by omitting `security.idmap.isolated`
Description
Incus is a system container and virtual machine manager. Prior to version 7.3.0, project-level enforcement of `restricted.containers.privilege=isolated` can be trivially bypassed, allowing a user to create a non-isolated (shared host idmap) container in a project that is configured to forbid them. The restriction only rejects an explicitly set `security.idmap.isolated=false` (or empty) and fails to enforce anything when the key is omitted entirely. Because an unset `security.idmap.isolated` defaults to `false` (non-isolation), a user simply leaves the key out and obtains exactly the container state the restriction is meant to forbid. This defeats the tenant-isolation guarantee the restriction exists to provide. Containers in the project share the host uid/gid map instead of receiving unique, non-overlapping ranges, weakening the isolation boundary between co-tenant containers and the host. Version 7.3.0 patches the issue.
INFO
Published Date :
Aug. 21, 2026, 3:16 p.m.
Last Modified :
Oct. 15, 2026, 7:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE |
Solution
- Update Incus to version 7.3.0 or newer.
- Verify project-level privilege enforcement settings.
- Configure containers for isolated idmaps.
- Ensure `security.idmap.isolated` is set correctly.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-62313.
| URL | Resource |
|---|---|
| https://github.com/lxc/incus/security/advisories/GHSA-53cg-qvg7-m8vg | |
| https://github.com/lxc/incus/security/advisories/GHSA-53cg-qvg7-m8vg |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-62313 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-62313
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-62313 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-62313 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 15, 2026
Action Type Old Value New Value Added Translation Title: incus de lxc, Description: Incus es un gestor de contenedores de sistema y máquinas virtuales. Antes de la versión 7.3.0, la aplicación a nivel de proyecto de 'restricted.containers.privilege=isolated' puede ser trivialmente eludida, permitiendo a un usuario crear un contenedor no aislado (con idmap de host compartido) en un proyecto configurado para prohibirlos. La restricción solo rechaza un 'security.idmap.isolated=false' (o vacío) establecido explícitamente y no logra aplicar nada cuando la clave se omite por completo. Debido a que un 'security.idmap.isolated' no establecido por defecto es 'false' (no aislamiento), un usuario simplemente omite la clave y obtiene exactamente el estado del contenedor que la restricción pretende prohibir. Esto anula la garantía de aislamiento de inquilinos que la restricción existe para proporcionar. Los contenedores en el proyecto comparten el mapa uid/gid del host en lugar de recibir rangos únicos y no superpuestos, debilitando el límite de aislamiento entre los contenedores de co-inquilinos y el host. La versión 7.3.0 corrige el problema. -
CVE Modified by [email protected]
Aug. 26, 2026
Action Type Old Value New Value Added Reference https://github.com/lxc/incus/security/advisories/GHSA-53cg-qvg7-m8vg Removed Reference https://github.com/lxc/incus/security/advisories/GHSA-53cg-qvg7-m8vg -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 26, 2026
Action Type Old Value New Value Added Reference https://github.com/lxc/incus/security/advisories/GHSA-53cg-qvg7-m8vg Added SSVC {'id': 'CVE-2026-62313', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-26T17:26:53.005002Z'} -
New CVE Received by [email protected]
Aug. 21, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'lxc', 'product': 'incus', 'versions': [{'status': 'affected', 'version': '< 7.3.0'}]}] Added Description Incus is a system container and virtual machine manager. Prior to version 7.3.0, project-level enforcement of `restricted.containers.privilege=isolated` can be trivially bypassed, allowing a user to create a non-isolated (shared host idmap) container in a project that is configured to forbid them. The restriction only rejects an explicitly set `security.idmap.isolated=false` (or empty) and fails to enforce anything when the key is omitted entirely. Because an unset `security.idmap.isolated` defaults to `false` (non-isolation), a user simply leaves the key out and obtains exactly the container state the restriction is meant to forbid. This defeats the tenant-isolation guarantee the restriction exists to provide. Containers in the project share the host uid/gid map instead of receiving unique, non-overlapping ranges, weakening the isolation boundary between co-tenant containers and the host. Version 7.3.0 patches the issue. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L Added CWE CWE-863 Added Reference https://github.com/lxc/incus/security/advisories/GHSA-53cg-qvg7-m8vg