CVE-2026-46611 Glances: XML-RPC Server Missing Host Header Validation Enables DNS Rebinding Attack
Attackers can use DNS rebinding to bypass host validation and exfiltrate system monitoring data from the Glances XML-RPC server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-46611?
CVE-2026-46611 is a medium-severity server-side request forgery vulnerability in nicolargo glances, published on 25 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Glances is an open-source system cross-platform monitoring tool. Prior to 4.5.5, the Glances XML-RPC server (glances -s, implemented in glances/server.py) does not validate the HTTP Host header, leaving it vulnerable to DNS rebinding attacks. An attacker can exploit DNS rebinding to exfiltrate the full system monitoring dataset from a victim's browser. This vulnerability is fixed in 4.5.5.
Which versions are affected by CVE-2026-46611?
3 open source packages ship an affected version, including glances.
| Package | Affected | Fixed in |
|---|---|---|
glances PyPI | All versions | 4.5.5 |
glances PyPI | All versions | 4.5.5 |
glances PyPI | All versions | 4.5.5 |
How do I fix CVE-2026-46611?
Upgrade glances to 4.5.5 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-46611 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46611 exists.
Sources
Also known as DEBIAN-CVE-2026-46611, GHSA-w856-8p3r-p338, PYSEC-2026-2498, UBUNTU-CVE-2026-46611.