CVE-2026-46611: nicolargo Glances DNS rebinding in XML-RPC server

CVE-2026-46611 · Severity: medium · CVSS 5.3 · Published 2026-06-25

Glances is a system monitoring tool used to track performance metrics like CPU, memory, and running processes. A security flaw in its server component allows an attacker to trick a user's web browser into bypassing security boundaries. If a user visits a malicious website while Glances is running, the attacker can steal sensitive system information, including full process lists which often contain passwords or API keys.

Technologies: glances (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2026-46611 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-46611 being exploited in the wild.
How severe is CVE-2026-46611?
Medium severity, with a CVSS score of 5.3, published 25 June 2026.
Which products and versions are affected?
glances (PyPI) < 4.5.5, ECOSYSTEM:introduced=0,fixed=4.5.5.
Is there a fix for CVE-2026-46611?
Yes. glances (PyPI): upgrade to 4.5.5 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-46611 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-46611?
Check whether you run glances (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • glances (PyPI): upgrade to 4.5.5 or later
    pip install "glances>=4.5.5"

Technical details

The Glances XML-RPC server (implemented in glances/server.py) inherits from Python's SimpleXMLRPCRequestHandler but fails to implement Host header validation. This omission, combined with an unrestricted 'Access-Control-Allow-Origin: *' header, enables DNS rebinding attacks. An attacker can lure a victim to a malicious website that, after a DNS TTL expiry, rebinds to the local or network IP where Glances is running. Because the server does not verify the Host header, the victim's browser will treat the attacker's site as same-origin and forward the request, allowing the attacker to exfiltrate the full system monitoring dataset (including process command lines, OS details, and network stats). This vulnerability is fixed in version 4.5.5.

Affected products

  • nicolargo Glances < 4.5.5

Identifiers

  • CVE-2026-46611
  • GHSA-w856-8p3r-p338
  • PYSEC-2026-2498

Timeline

  • 2026-06-13: patched: Version 4.5.5 released
  • 2026-06-25: disclosed: CVE-2026-46611 published

References

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