# 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.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N`)
- **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:** Yes
- **Published:** 25 Jun 2026
- **Updated:** 26 Jun 2026
- **Also known as:** DEBIAN-CVE-2026-46611, GHSA-w856-8p3r-p338, PYSEC-2026-2498, UBUNTU-CVE-2026-46611

## 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.

Weakness: CWE-350 (Reliance on Reverse DNS Resolution for a Security-Critical Action), CWE-346 (Origin Validation Error)

## Which versions are affected by CVE-2026-46611?

3 open source packages ship an affected version, including glances.


| Package | Ecosystem | 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.

## Is CVE-2026-46611 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46611 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-46611 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46611 exists.

Affected packages and fixed versions:
- glances (PyPI): affected all versions; fixed in 4.5.5
- glances (PyPI): affected all versions; fixed in 4.5.5
- glances (PyPI): affected all versions; fixed in 4.5.5

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-46611/ (Markdown: https://insights.sbomify.com/CVE-2026-46611/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-46611
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-46611
- OSV: https://osv.dev/vulnerability/CVE-2026-46611

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-46611/
Summaries are generated and may contain mistakes; the official description above is the record.