CVE-2026-3484Public exploitNetwork attack vector

Authenticated command execution via unescaped Nmap flags

Published Mar 3, 2026 · Updated Mar 3, 2026

Command injection in PhialsBasement nmap-mcp-server allows remote authenticated users to execute host commands through Nmap scan requests. The runNmapScan handler in src/index.ts concatenates the user-controlled additionalFlags value into a command string passed to child_process.exec, so shell metacharacters are interpreted. Access to an MCP client authorized to invoke run_nmap_scan is required, and injected commands run with the Windows server process's privileges.

CVSS severity5.3
Medium
EPSS probability2.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in PhialsBasement nmap-mcp-server allows remote authenticated users to execute host commands through Nmap scan requests. The runNmapScan handler in src/index.ts concatenates the user-controlled additionalFlags value into a command string passed to child_process.exec, so shell metacharacters are interpreted. Access to an MCP client authorized to invoke run_nmap_scan is required, and injected commands run with the Windows server process's privileges.

The record

CVE
CVE-2026-3484
Published
Mar 3, 2026
Updated
Mar 3, 2026
Vendor
PhialsBasement
Product
nmap-mcp-server
Classifications
CWE-74, CWE-77, T1059.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=bee6d23547d57ae02460022f7c78ac0893092e38

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

PhialsBasement · nmap-mcp-serverversion=bee6d23547d57ae02460022f7c78ac0893092e38

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059.003Command and Scripting Interpreter: Windows Command Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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