CVE-2026-34839 Details
Description
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.
A cross-origin information disclosure vulnerability has been identified in Glances, an open-source cross-platform system monitoring tool. Prior to version 4.5.4, the Glances web server's REST API (/api/4/*) was accessible without authentication and allowed cross-origin requests from any origin due to a permissive CORS policy. This vulnerability enabled malicious websites to read sensitive system information from a running Glances instance in the victim's browser, leading to unauthorized data exfiltration. The affected API endpoint exposed extensive system details, including the process list, memory and disk usage, network interfaces, and running services. The issue has been patched in version 4.5.4.
Users can update to Glances version 4.5.4 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 21, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/nicolargo/glances/security/advisories/GHSA-gfc2-9qmw-w7vh | CISA-ADP | ExploitVendor Advisory |
| https://github.com/nicolargo/glances/commit/fdfb977b1d91b5e410bc06c4e19f8bedb0005ce9 | [email protected] | Patch |
| https://github.com/nicolargo/glances/security/advisories/GHSA-gfc2-9qmw-w7vh | [email protected] | ExploitVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-306 | Missing Authentication for Critical Function | [email protected] |
| CWE-200 | Exposure of Sensitive Information to an Unauthorized Actor | [email protected] |
| CWE-306 | Missing Authentication for Critical Function | [email protected] |
| CWE-942 | Permissive Cross-domain Policy with Untrusted Domains | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| nicolargo glances | < 4.5.4 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 24, 2026 | Initial Analysis | [email protected] |
| Apr 21, 2026 | CVE Modified | CISA-ADP |
| Apr 21, 2026 | New CVE Received | [email protected] |