CVE-2026-32632: Glances's REST/WebUI Lacks Host Validation and Remains Exposed to DNS Rebinding
CVE-2026-32632 · Severity: low · CVSS 3.1 · Published 2026-03-18
Glances is an open-source system cross-platform monitoring tool. Glances recently added DNS rebinding protection for the MCP endpoint, but prior to version 4.5.2, the main REST/WebUI FastAPI application still accepts arbitrary `Host` headers and does not apply `TrustedHostMiddleware` or an equivalent host allowlist. As a result, the REST API, WebUI, and token endpoint remain reachable through attacker-controlled domains in classic DNS rebinding scenarios. Once the victim browser has rebound the attacker domain to the Glances service, same-origin policy no longer protects the API because the browser considers the rebinding domain to be the origin. This is a distinct issue from the previously reported default CORS weakness. CORS is not required for exploitation here because DNS rebinding causes the victim browser to treat the malicious domain as same-origin with the rebinding target. Version 4.5.2 contains a patch for the issue.
Yes. glances (PyPI): upgrade to 4.5.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
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