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bdu:2026-10404

BREW-glances-CVE-2026-34839 — Glances Vulnerable to Cross-Origin Information Disclosure via Unauthenticated REST API (/api/4) due to Permissive CORS

Affected: Homebrew: glances

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.

EUVD-2026-292277

fkie_cve-2026-34839

GHSA-gfc2-9qmw-w7vh — Glances: Cross-Origin Information Disclosure via Unauthenticated REST API (/api/4) due to Permissive CORS

Affected: PyPI: Glances

### Summary 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.

### Details When Glances is started in web mode (e.g., `glances -w -B 0.0.0.0`), it exposes a REST API endpoint at: http://<host>:61208/api/4/all The server responds with: Access-Control-Allow-Origin: *

This allows any origin to perform cross-origin requests and read responses.

The `/api/4/all` endpoint returns extensive system information, including: - Process list (`processlist`) - System details (hostname, OS, CPU info) - Memory and disk usage - Network interfaces and IP address - Running services and metrics Because no authentication is required by default, this data is accessible to any web page.

### PoC 1. Start Glances: glances -w -B 0.0.0.0

2. Create a malicious HTML file:

``` <!DOCTYPE html> <html> <body> <script> fetch("http://<victim-ip>:61208/api/4/all") .then(r => r.json()) .then(data => { console.log("DATA:", data); }); </script> </body> </html> ``` 2. Open the file in a browser wh…

openSUSE-SU-2026:10602-1 — glances-common-4.5.4-1.1 on GA media

glances-common-4.5.4-1.1 on GA media

PYSEC-2026-2175

Affected: PyPI: glances

UBUNTU-CVE-2026-34839

Affected: Ubuntu:Pro:16.04:LTS: glances, Ubuntu:Pro:18.04:LTS: glances, Ubuntu:Pro:20.04:LTS: glances, Ubuntu:22.04:LTS: glances, Ubuntu:24.04:LTS: glances, Ubuntu:25.10: glances, Ubuntu:26.04:LTS: glances