LXC Incus up to 7.1.x Exec Endpoint record-output path traversal

Summaryinfo

A vulnerability was found in LXC Incus up to 7.1.x. It has been classified as very critical. Affected by this vulnerability is an unknown functionality of the component Exec Endpoint. Performing a manipulation of the argument record-output results in path traversal. This vulnerability is cataloged as CVE-2026-48750. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as very critical has been found in LXC Incus up to 7.1.x. This affects an unknown code block of the component Exec Endpoint. The manipulation of the argument record-output with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Incus is a system container and virtual machine manager. Prior to version 7.2.0, the `record-output` parameter of the `/instances/$name/exec` endpoint stores the output of the command in the `exec-output` directory of the instance. If `exec-output` is a symlink, file named `exec_UUID.stdout` and `exec_UUID.stderr` can be written to an arbitrary location where the `.stdout` file will contain arbitrary content. This behavior can be abused for arbitrary command execution. Version 7.2.0 contains a patch.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-48750 since 05/22/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/21/2026). The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 7.2.0 eliminates this vulnerability.

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Productinfo

Vendor

• LXC

Name

• Incus

Version

• 7.0
• 7.1

Website

• Product: https://github.com/lxc/incus/

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