nicolargo glances up to 4.5.3 REST API /api/4/ information disclosure

Summaryinfo

A vulnerability categorized as problematic has been discovered in nicolargo glances up to 4.5.3. This vulnerability affects unknown code of the file /api/4/ of the component REST API. Such manipulation leads to information disclosure. This vulnerability is traded as CVE-2026-34839. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in nicolargo glances up to 4.5.3 and classified as problematic. Affected by this issue is an unknown functionality of the file /api/4/ of the component REST API. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

Glances is an open-source system cross-platform monitoring tool. Prior to version 4.5.4, the Glances web server exposes a REST API (`/api/4/*`) that is accessible without authentication and allows cross-origin requests from any origin due to a permissive CORS policy (`Access-Control-Allow-Origin: *`). This allows a malicious website to read sensitive system information from a running Glances instance in the victim’s browser, leading to cross-origin data exfiltration. While a previous advisory exists for XML-RPC CORS issues, this report demonstrates that the REST API (`/api/4/*`) is also affected and exposes significantly more sensitive data. Version 4.5.4 patches the issue.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-34839 since 03/30/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

Upgrading to version 4.5.4 eliminates this vulnerability. Applying the patch fdfb977b1d91b5e410bc06c4e19f8bedb0005ce9 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• nicolargo

Name

• glances

Version

• 4.5.0
• 4.5.1
• 4.5.2
• 4.5.3

License

• open-source

Website

• Product: https://github.com/nicolargo/glances/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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