CVE-2026-46608
Glances: XML-RPC Multi-Origin CORS Configuration Silently Falls Back to Wildcard (Incomplete Fix for CVE-2026-33533)
Impact
Glances is an open-source system cross-platform monitoring tool. Prior to 4.5.5, 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 cors_origins 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. 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. This vulnerability is fixed in 4.5.5.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | glances | < 4.5.5 | 4.5.5 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-87qc-fj39-wccr
- https://github.com/nicolargo/glances/security/advisories/GHSA-87qc-fj39-wccr
- https://github.com/nicolargo/glances/releases/tag/v4.5.5
- https://nvd.nist.gov/vuln/detail/CVE-2026-46608
- https://github.com/nicolargo/glances
- https://github.com/pypa/advisory-database/tree/main/vulns/glances/PYSEC-2026-2495.yaml
- https://pypi.org/project/glances