Vulnerability · Published Jun 25, 2026 · Assigned by GitHub_M
CVE-2026-46608Glances: XML-RPC Multi-Origin CORS Configuration Silently Falls Back to Wildcard (Incomplete Fix for CVE-2026-33533)
High 7.4
In plain English
A high-severity security flaw in glances from nicolargo. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | glances | no fix listed | DEBIAN-CVE-2026-46608 |
| Debian:14 | glances | 4.5.5+dfsg-1 | DEBIAN-CVE-2026-46608 |
| PyPI | glances | 4.5.5 | GHSA-87qc-fj39-wccr |
| PyPI | glances | 4.5.5 | PYSEC-2026-2495 |
| Ubuntu:22.04:LTS | glances | no fix listed | UBUNTU-CVE-2026-46608 |
| Ubuntu:24.04:LTS | glances | no fix listed | UBUNTU-CVE-2026-46608 |
| Ubuntu:25.10 | glances | no fix listed | UBUNTU-CVE-2026-46608 |
| Ubuntu:26.04:LTS | glances | no fix listed | UBUNTU-CVE-2026-46608 |
Affected products (as reported)
Weakness: CWE-183, CWE-942 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
References
- https://github.com/nicolargo/glances/security/advisories/GHSA-87qc-fj39-wccr x_refsource_CONFIRM
- https://github.com/nicolargo/glances/releases/tag/v4.5.5 x_refsource_MISC