Vulnerability · Published Mar 18, 2026 · Assigned by GitHub_M
CVE-2026-32632Glances's REST/WebUI Lacks Host Validation and Remains Exposed to DNS Rebinding
Medium 5.9
In plain English
A medium-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 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | glances | no fix listed | DEBIAN-CVE-2026-32632 |
| Debian:13 | glances | no fix listed | DEBIAN-CVE-2026-32632 |
| Debian:14 | glances | 4.5.2+dfsg-1 | DEBIAN-CVE-2026-32632 |
| PyPI | glances | 4.5.2 | GHSA-hhcg-r27j-fhv9 |
| PyPI | glances | 4.5.2 | PYSEC-2026-2171 |
| Ubuntu:22.04:LTS | glances | no fix listed | UBUNTU-CVE-2026-32632 |
| Ubuntu:24.04:LTS | glances | no fix listed | UBUNTU-CVE-2026-32632 |
| Ubuntu:25.10 | glances | no fix listed | UBUNTU-CVE-2026-32632 |
| Ubuntu:26.04:LTS | glances | no fix listed | UBUNTU-CVE-2026-32632 |
| Ubuntu:26.10 | glances | no fix listed | UBUNTU-CVE-2026-32632 |
Affected products (as reported)
Weakness: CWE-346 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N
References
- https://github.com/nicolargo/glances/security/advisories/GHSA-hhcg-r27j-fhv9 x_refsource_CONFIRM
- https://github.com/nicolargo/glances/commit/5850c564ee10804fdf884823b9c210eb954dd1f9 x_refsource_MISC
- https://github.com/nicolargo/glances/releases/tag/v4.5.2 x_refsource_MISC