Glances: XML-RPC Server Missing Host Header Validation Enables DNS Rebinding Attack

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

5.3 · CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

EPSS

• CVE-2026-46611: 0.14% estimated exploitation activity in the next 30 days; percentile 3.81 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The Glances XML-RPC server (glances -s, implemented in glances/server.py) does not validate the HTTP Host header, leaving it vulnerable to DNS rebinding attacks. CVE-2026-32632 (patched in 4.5.2) added TrustedHostMiddleware to the REST/WebUI server; the MCP server has had equivalent protection since 4.5.1. The XML-RPC server received neither fix and has no allowed-hosts configuration key. Combined with the unrestricted Access-Control-Allow-Origin: header (see companion advisory for CVE-2026-33533 and its incomplete fix), an attacker can exploit DNS rebinding to exfiltrate the full system monitoring dataset from a victim's browser. --- Details Affected component: glances/server.py — GlancesXMLRPCHandler / GlancesXMLRPCServer Direct URL (commit 04579778e733d705898a169e049dc84772c852da): - https://github.com/nicolargo/glances/blob/04579778e733d705898a169e049dc84772c852da/glances/server.py Contrast — patched backends: -…

Published by the source

22 Jun 2026, 21:31 UTC

Last modified by the source

21 Jul 2026, 15:00 UTC

Source last checked

26 Oct 2026, 13:49 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-w856-8p3r-p338

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-w856-8p3r-p338

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# Patch Next advisory brief: CVE-2026-46611

Advisory: Glances: XML-RPC Server Missing Host Header Validation Enables DNS Rebinding Attack
IDs: CVE-2026-46611, GHSA-w856-8p3r-p338
Record: https://patchnext.com/advisories/cve-2026-46611 (revision 2, source checked 26 Oct 2026, 13:49 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: glances 4.5.5. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI glances: affected < 4.5.5; fixed in 4.5.5

## Suggested inspection (read-only)
- `python -m pip show glances`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on glances.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-w856-8p3r-p338 (OSV record GHSA-w856-8p3r-p338 lists affected ranges: PyPI glances >=0 <4.5.5 (fixed))
- Verified: https://github.com/advisories/GHSA-w856-8p3r-p338 (GitHub-reviewed advisory GHSA-w856-8p3r-p338 lists affected ranges: PyPI glances >=0 <4.5.5)

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