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.
References
| Link | Resource |
|---|---|
| https://github.com/nicolargo/glances/commit/fdfb977b1d91b5e410bc06c4e19f8bedb0005ce9 | Patch |
| https://github.com/nicolargo/glances/security/advisories/GHSA-gfc2-9qmw-w7vh | Exploit Vendor Advisory |
| https://github.com/nicolargo/glances/security/advisories/GHSA-gfc2-9qmw-w7vh | Exploit Vendor Advisory |
Configurations
History
24 Apr 2026, 19:09
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/nicolargo/glances/commit/fdfb977b1d91b5e410bc06c4e19f8bedb0005ce9 - Patch | |
| References | () https://github.com/nicolargo/glances/security/advisories/GHSA-gfc2-9qmw-w7vh - Exploit, Vendor Advisory | |
| First Time |
Nicolargo glances
Nicolargo |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 6.5 |
| CPE | cpe:2.3:a:nicolargo:glances:*:*:*:*:*:*:*:* |
21 Apr 2026, 20:16
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/nicolargo/glances/security/advisories/GHSA-gfc2-9qmw-w7vh - |
21 Apr 2026, 00:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-04-21 00:16
Updated : 2026-04-24 19:09
NVD link : CVE-2026-34839
Mitre link : CVE-2026-34839
CVE.ORG link : CVE-2026-34839
JSON object : View
Products Affected
nicolargo
- glances