# CVE-2026-35018: NetComm NF20MESH < R6B032 Authenticated RCE via OS Command Injection

> Authenticated attackers can execute arbitrary root commands on NetComm NF20MESH routers via OS command injection in the user account management function.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Jun 2026
- **Updated:** 14 Jul 2026
- **Also known as:** GHSA-jqc2-w244-p56p

## What is CVE-2026-35018?

CVE-2026-35018 is a high-severity command injection vulnerability in NetComm Wireless Pty Ltd NF20MESH, published on 23 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

NetComm NF20MESH routers running firmware R6B031 and earlier contain an authenticated remote code execution vulnerability that allows authenticated attackers to execute arbitrary commands as root by injecting shell metacharacters into the username JSON parameter processed by the dalStorage_addUserAccount function. Attackers can exploit the unsafe concatenation of user-supplied input into a shell command string passed to rut_doSystemAction without sanitization to achieve full root-level command execution on the underlying operating system.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2026-35018?


## How do I fix CVE-2026-35018?

No fix has been published for CVE-2026-35018 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-35018 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-35018 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-35018 and fix it if it is affected.

What it is: CVE-2026-35018 is a high-severity command injection vulnerability in NetComm Wireless Pty Ltd NF20MESH, published on 23 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-35018 exists.

Affected product: NetComm Wireless Pty Ltd NF20MESH. 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-2026-35018/ (Markdown: https://insights.sbomify.com/CVE-2026-35018/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-35018
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-35018
- OSV: https://osv.dev/vulnerability/CVE-2026-35018

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-35018/
Summaries are generated and may contain mistakes; the official description above is the record.