Vulnerability · Published Apr 2, 2026 · Assigned by GitHub_M
CVE-2026-33533Glances Vulnerable to Cross-Origin System Information Disclosure via XML-RPC Server CORS Wildcard
High 7.1
In plain English
A high-severity security flaw in glances from nicolargo. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% 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 version 4.5.3, the Glances XML-RPC server (activated with glances -s or glances --server) sends Access-Control-Allow-Origin: * on every HTTP response. Because the XML-RPC handler does not validate the Content-Type header, an attacker-controlled webpage can issue a CORS "simple request" (POST with Content-Type: text/plain) containing a valid XML-RPC payload. The browser sends the request without a preflight check, the server processes the XML body and returns the full system monitoring dataset, and the wildcard CORS header lets the attacker's JavaScript read the response. The result is complete exfiltration of hostname, OS version, IP addresses, CPU/memory/disk/network stats, and the full process list including command lines (which often contain tokens, passwords, or internal paths). This issue has been patched in version 4.5.3.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | glances | no fix listed | DEBIAN-CVE-2026-33533 |
| Debian:13 | glances | no fix listed | DEBIAN-CVE-2026-33533 |
| Debian:14 | glances | 4.5.3.2+dfsg-1 | DEBIAN-CVE-2026-33533 |
| PyPI | glances | 4.5.3 | GHSA-7p93-6934-f4q7 |
| PyPI | glances | 4.5.3 | PYSEC-2026-2173 |
| Ubuntu:22.04:LTS | glances | no fix listed | UBUNTU-CVE-2026-33533 |
| Ubuntu:24.04:LTS | glances | no fix listed | UBUNTU-CVE-2026-33533 |
| Ubuntu:25.10 | glances | no fix listed | UBUNTU-CVE-2026-33533 |
| Ubuntu:26.04:LTS | glances | no fix listed | UBUNTU-CVE-2026-33533 |
| Ubuntu:26.10 | glances | no fix listed | UBUNTU-CVE-2026-33533 |
Affected products (as reported)
Weakness: CWE-942 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
References
- https://github.com/nicolargo/glances/security/advisories/GHSA-7p93-6934-f4q7 x_refsource_CONFIRM
- https://github.com/nicolargo/glances/commit/dcb39c3f12b2a1eec708c58d22d7a1d62bdf5fa1 x_refsource_MISC
- https://github.com/nicolargo/glances/releases/tag/v4.5.3 x_refsource_MISC