# CVE-2026-9218: Insufficient input validation vulnerability in Certain NETGEAR routers allows unauthorized access

> An attacker with admin credentials on the local network can execute unauthorized commands on NETGEAR routers via the NTP settings.

- **Severity:** Medium 4.3 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/V:D/RE:L/U:Amber`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Oct 2026
- **Updated:** 16 Oct 2026
- **Also known as:** GHSA-gxq5-cgpc-wcvr

## What is CVE-2026-9218?

CVE-2026-9218 is a medium-severity command injection vulnerability in NETGEAR CBR40, published on 13 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Insufficient input validation vulnerability in time server (NTP) setting of the listed NETGEAR models allows an attacker who is connected to the router’s local network and has the router’s administrator credentials to run unauthorized commands on the router. This vulnerability could impact the integrity of the affected router. There is no impact on confidentiality or availability of the affected router.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2026-9218?


## How do I fix CVE-2026-9218?

No fix has been published for CVE-2026-9218 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-9218 being exploited?

There is no known exploitation of CVE-2026-9218 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-9218 and fix it if it is affected.

What it is: CVE-2026-9218 is a medium-severity command injection vulnerability in NETGEAR CBR40, published on 13 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-9218 in the wild and no public exploit code.

Affected product: NETGEAR CBR40. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2026-9218/ (Markdown: https://insights.sbomify.com/CVE-2026-9218/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-9218
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-9218
- OSV: https://osv.dev/vulnerability/CVE-2026-9218

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-9218/
Summaries are generated and may contain mistakes; the official description above is the record.