Cross-Origin Data Exposure in Glances System Monitoring Tool
CVE-2026-34839

7.7HIGH

Key Information:

Vendor

Nicolargo

Status
Glances
Vendor
CVE Published:
20 April 2026

What is CVE-2026-34839?

The Glances system monitoring tool has a critical vulnerability that allows unauthenticated access to its REST API endpoint (/api/4/*). This oversight enables cross-origin requests due to a permissive CORS policy (Access-Control-Allow-Origin: *). Consequently, attackers can exploit this weakness to extract sensitive system information from the tool when accessed from a malicious site, potentially compromising user data and system security. The issue has been rectified in version 4.5.4.

Affected Version(s)

glances < 4.5.4

References

https://github.com/nicolargo/glances/security/advisories/...
x_refsource_CONFIRM
https://github.com/nicolargo/glances/commit/fdfb977b1d91b...
x_refsource_MISC

CVSS V4

Score:
7.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.