CVE-2026-34839
Description
Glances is an open-source system cross-platform monitoring tool. Prior to version 4.5.4, the Glances web server exposes a REST API (/api/4/*) that is accessible without authentication and allows cross-origin requests from any origin due to a permissive CORS policy (Access-Control-Allow-Origin: *). This allows a malicious website to read sensitive system information from a running Glances instance in the victim’s browser, leading to cross-origin data exfiltration. While a previous advisory exists for XML-RPC CORS issues, this report demonstrates that the REST API (/api/4/*) is also affected and exposes significantly more sensitive data. Version 4.5.4 patches the issue.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
GlancesPyPI | < 4.5.4 | 4.5.4 |
Affected products
3- ghsa-coords2 versions
< 4.5.4+ 1 more
- (no CPE)range: < 4.5.4
- (no CPE)range: < 4.5.4-1.1
Patches
Vulnerability mechanics
References
4- github.com/nicolargo/glances/commit/fdfb977b1d91b5e410bc06c4e19f8bedb0005ce9nvdPatchWEB
- github.com/nicolargo/glances/security/advisories/GHSA-gfc2-9qmw-w7vhnvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-gfc2-9qmw-w7vhghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-34839ghsaADVISORY
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