glances: Glances is an open-source system cross-platform monitoring tool
CVE-2026-34839 is fixed in glances on 1 platform by DEBIAN-CVE-2026-34839 (version 4.5.4+dfsg-1), released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| glances · Debian 14 | 4.5.4+dfsg-1 | DEBIAN-CVE-2026-34839 | May 15, 2026 |
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