CVE-2026-41684
Incus: Nil Dereferences on Restore via Malformed YAML
Description
Incus is a system container and virtual machine manager. Prior to version 7.0.0, backup.GetInfo() trusts the inline backup/index.yaml config when present and only falls back to parsing the legacy backup/container/backup.yaml file if result.Config == nil. As a result, an archive can carry a valid inline config that passes the initial import preflight while also carrying a malformed legacy backup/container/backup.yaml file that is reparsed later from the restored file system. ParseConfigYamlFile() accepts YAML documents with no container section, and multiple downstream consumers then dereference. Container without checking for nil. Confirmed examples in the instance restore and import flow include backup.UpdateInstanceConfig() and internalImportFromBackup(). An authenticated user with permission to import instance backups may be able to crash the Incus daemon with a crafted backup archive whose inline backup/index.yaml is valid but whose extracted legacy backup.yaml omits container. The crash occurs in the restore path after archive extraction has begun. This issue has been patched in version 7.0.0.
INFO
Published Date :
May 7, 2026, 2:16 p.m.
Last Modified :
Oct. 26, 2026, 8:10 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 7.0.0 or later.
- Apply vendor patches promptly.
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-2026-41684.
| URL | Resource |
|---|---|
| https://github.com/lxc/incus/releases/tag/v7.0.0 | Patch Product |
| https://github.com/lxc/incus/security/advisories/GHSA-x5r6-jr56-89pv | Exploit Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-41684 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-2026-41684
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-2026-41684 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-41684 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. 26, 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 7.0.0, backup.GetInfo() confía en la configuración en línea backup/index.yaml cuando está presente y solo recurre al análisis del archivo heredado backup/container/backup.yaml si result.Config == nil. Como resultado, un archivo puede contener una configuración en línea válida que pasa la verificación previa de importación inicial, mientras que también contiene un archivo heredado backup/container/backup.yaml malformado que se vuelve a analizar más tarde desde el sistema de archivos restaurado. ParseConfigYamlFile() acepta documentos YAML sin sección de contenedor, y múltiples consumidores posteriores desreferencian Contenedor sin verificar si es nulo. Ejemplos confirmados en el flujo de restauración e importación de instancias incluyen backup.UpdateInstanceConfig() e internalImportFromBackup(). Un usuario autenticado con permiso para importar copias de seguridad de instancias podría ser capaz de bloquear el demonio Incus con un archivo de copia de seguridad manipulado cuyo backup/index.yaml en línea es válido, pero cuyo backup.yaml heredado extraído omite contenedor. El bloqueo ocurre en la ruta de restauración después de que ha comenzado la extracción del archivo. Este problema ha sido parcheado en la versión 7.0.0. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'lxc', 'product': 'incus', 'versions': [{'status': 'affected', 'version': '< 7.0.0'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-41684', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-05-07T13:45:52.042246Z'} -
Initial Analysis by [email protected]
May. 07, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:linuxcontainers:incus:*:*:*:*:*:*:*:* versions up to (excluding) 7.0.0 Added Reference Type GitHub, Inc.: https://github.com/lxc/incus/releases/tag/v7.0.0 Types: Patch, Product Added Reference Type GitHub, Inc.: https://github.com/lxc/incus/security/advisories/GHSA-x5r6-jr56-89pv Types: Exploit, Mitigation, Vendor Advisory -
New CVE Received by [email protected]
May. 07, 2026
Action Type Old Value New Value Added Description Incus is a system container and virtual machine manager. Prior to version 7.0.0, backup.GetInfo() trusts the inline backup/index.yaml config when present and only falls back to parsing the legacy backup/container/backup.yaml file if result.Config == nil. As a result, an archive can carry a valid inline config that passes the initial import preflight while also carrying a malformed legacy backup/container/backup.yaml file that is reparsed later from the restored file system. ParseConfigYamlFile() accepts YAML documents with no container section, and multiple downstream consumers then dereference. Container without checking for nil. Confirmed examples in the instance restore and import flow include backup.UpdateInstanceConfig() and internalImportFromBackup(). An authenticated user with permission to import instance backups may be able to crash the Incus daemon with a crafted backup archive whose inline backup/index.yaml is valid but whose extracted legacy backup.yaml omits container. The crash occurs in the restore path after archive extraction has begun. This issue has been patched in version 7.0.0. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-476 Added Reference https://github.com/lxc/incus/releases/tag/v7.0.0 Added Reference https://github.com/lxc/incus/security/advisories/GHSA-x5r6-jr56-89pv