Missing Authentication for Critical Function Affecting glances package, versions <4.5.4+dfsg-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.41% (33rd percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-GLANCES-16134732
  • published23 Apr 2026
  • disclosed21 Apr 2026

Introduced: 21 Apr 2026

CVE-2026-34839  (opens in a new tab)
CWE-306  (opens in a new tab)

How to fix?

Upgrade Debian:unstable glances to version 4.5.4+dfsg-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream glances package and not the glances package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1