# CVE-2026-3484: PhialsBasement nmap-mcp-server Nmap CLI index.ts child_process.exec command injection

> Remote attackers can execute arbitrary commands via the Nmap CLI handler in the nmap-mcp-server library, requiring a patch to mitigate.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X`)
- **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:** 3 Mar 2026
- **Updated:** 4 Mar 2026
- **Also known as:** GHSA-xc68-rrqc-qgq3

## What is CVE-2026-3484?

CVE-2026-3484 is a medium-severity command injection vulnerability in PhialsBasement nmap-mcp-server, published on 3 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was detected in PhialsBasement nmap-mcp-server up to bee6d23547d57ae02460022f7c78ac0893092e38. Affected by this issue is the function child_process.exec of the file src/index.ts of the component Nmap CLI Command Handler. The manipulation results in command injection. The attack may be performed from remote. This product utilizes a rolling release system for continuous delivery, and as such, version information for affected or updated releases is not disclosed. The patch is identified as 30a6b9e1c7fa6146f51e28d6ab83a2568d9a3488. It is best practice to apply a patch to resolve this issue.

Weakness: CWE-77 (Improper Neutralization of Special Elements used in a Command), CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2026-3484?

2 open source packages ship an affected version, including mcp-nmap-server. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `mcp-nmap-server` | npm | All versions to 1.0.1 | None |
| `mcp-nmap-server` | npm | All versions to 1.0.1 | None |

Products: Phialsbasement Mcp Nmap Server.

## How do I fix CVE-2026-3484?

No fix has been published for CVE-2026-3484 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3484 being exploited?

There is no known exploitation of CVE-2026-3484 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3484 and fix it if it is affected.

What it is: CVE-2026-3484 is a medium-severity command injection vulnerability in PhialsBasement nmap-mcp-server, published on 3 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-3484 in the wild and no public exploit code.

Affected packages and fixed versions:
- mcp-nmap-server (npm): affected all versions up to 1.0.1; no fix listed
- mcp-nmap-server (npm): affected all versions up to 1.0.1; no fix listed

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-2026-3484/ (Markdown: https://insights.sbomify.com/CVE-2026-3484/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3484
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3484
- OSV: https://osv.dev/vulnerability/CVE-2026-3484

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-3484/
Summaries are generated and may contain mistakes; the official description above is the record.