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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-34839)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-34839)

ID	Name	Product	Family	Severity
309709	Linux Distros Unpatched Vulnerability : CVE-2026-34839	Nessus	Misc.	high
440709	SCA: security update for Glances (GHSA-gfc2-9qmw-w7vh)	Tenable Cloud Security	SCA Checks	high
440709	SCA: security update for Glances (GHSA-gfc2-9qmw-w7vh)	Tenable Self-Hosted Container Security	SCA Checks	high

Detections

Analytics

CVE-2026-34839

high

Tenable Plugins

high

high

high