Glances: XML-RPC Multi-Origin CORS Configuration Silently Falls Back to Wildcard (Incomplete Fix for CVE-2026-33533)

Exploitation

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

CVSS

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

EPSS

• CVE-2026-46608: 0.40% estimated exploitation activity in the next 30 days; percentile 34.36 (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) introduced a configurable CORS origin list in version 4.5.3 as a mitigation for CVE 2026-33533. However, the implementation silently falls back to Access-Control-Allow-Origin: whenever corsorigins contains more than one entry. An operator who configures an explicit two-entry allowlist (e.g. two internal dashboard origins) intending to restrict browser access instead receives the unrestricted wildcard — the same exposure that the original CVE described. A malicious web page served from any origin can issue a CORS simple request to /RPC2 and read the full system monitoring dataset without the victim's knowledge. --- Details Affected file: glances/server.py, class GlancesXMLRPCServer, line 113 Direct URL (commit 04579778e733d705898a169e049dc84772c852da): - https://github.com/nicolargo/glances/blob/04579778e733d705898a169e049dc84772c852da/glances/server.py#L113 The corsorigin value is then echoed back as the Access-Control-Allow-Origin…

Published by the source

22 Jun 2026, 21:27 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-87qc-fj39-wccr

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-87qc-fj39-wccr

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# Patch Next advisory brief: CVE-2026-46608

Advisory: Glances: XML-RPC Multi-Origin CORS Configuration Silently Falls Back to Wildcard (Incomplete Fix for CVE-2026-33533)
IDs: CVE-2026-46608, GHSA-87qc-fj39-wccr
Record: https://patchnext.com/advisories/cve-2026-46608 (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: High (CVSS 7.4)
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-87qc-fj39-wccr (OSV record GHSA-87qc-fj39-wccr lists affected ranges: PyPI glances >=0 <4.5.5 (fixed))
- Verified: https://github.com/advisories/GHSA-87qc-fj39-wccr (GitHub-reviewed advisory GHSA-87qc-fj39-wccr lists affected ranges: PyPI glances >=0 <4.5.5)

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