VulnerabilityPublished 3 Mar 2026Updated 4 Mar 2026

CVE-2026-3484: PhialsBasement nmap-mcp-server · Command Injection

Affects PhialsBasement nmap-mcp-serverSource CVE Database V5

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Not known to be exploited · CVSS 5.3 Medium.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 4.0 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 3.3% chance of exploitation in 30 days – higher than 88% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: Low
User Interaction: None
Vulnerable system confidentiality: Low
Vulnerable system integrity: Low
Vulnerable system availability: Low
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: Low: The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the Vulnerable System.
Vulnerable system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Vulnerable System.
Vulnerable system availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the Vulnerable System are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 3 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
PhialsBasementnmap-mcp-server	Affected =bee6d23547d57ae02460022f7c78ac0893092e38	Fixed in–

AI-suggested

To mitigate CVE-2026-3484, organizations should immediately apply the patch identified by commit 30a6b9e1c7fa6146f51e28d6ab83a2568d9a3488 to the nmap-mcp-server. Given the rolling release model, continuous monitoring of the project's repository for updates is essential. Restrict network access to the nmap-mcp-server service using firewalls or network segmentation to limit exposure to trusted hosts only. Implement strict input validation and sanitization in any custom integrations or wrappers around the vulnerable component. Employ runtime application self-protection (RASP) or intrusion detection systems (IDS) to monitor for suspicious command execution patterns. Regularly audit logs for unusual command execution or access attempts. Consider running the service with the least privilege necessary to limit the impact of potential exploitation. Finally, maintain an incident response plan to quickly address any suspected compromise stemming from this vulnerability.

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.

Impact

The impact of CVE-2026-3484 is substantial for organizations using the PhialsBasement nmap-mcp-server, particularly those relying on it for network scanning and management. Successful exploitation allows remote attackers to execute arbitrary commands, potentially leading to full system compromise, data theft, service disruption, or lateral movement within networks. Confidentiality can be breached by unauthorized data access or exfiltration; integrity can be compromised by altering system files or configurations; availability can be affected by executing disruptive commands or malware. Since the vulnerability requires no authentication or user interaction, it can be exploited by any remote attacker with network access to the service. This elevates the risk in environments where the service is exposed to untrusted networks or the internet. The rolling release nature of the product may delay patch deployment, increasing exposure time. Organizations in sectors with high reliance on network scanning tools, such as cybersecurity firms, managed service providers, and enterprises with complex network infrastructures, face higher operational risks.

Summary

CVE-2026-3484 is a command injection vulnerability found in the PhialsBasement nmap-mcp-server, a component that handles Nmap CLI commands. The vulnerability resides in the child_process.exec function within src/index.ts, which executes system commands. Due to insufficient input validation or sanitization, an attacker can manipulate inputs to inject arbitrary commands that the server executes with the privileges of the running process. The attack vector is remote network access, requiring no authentication or user interaction, and has low attack complexity. The product follows a rolling release system, meaning version numbers are replaced by commit hashes, complicating identification of affected versions; the vulnerability affects versions up to commit bee6d23547d57ae02460022f7c78ac0893092e38. A patch is available in commit 30a6b9e1c7fa6146f51e28d6ab83a2568d9a3488. The CVSS 4.0 base score is 5.3 (medium severity), reflecting the moderate impact and ease of exploitation. The vulnerability can lead to unauthorized command execution, potentially compromising system confidentiality, integrity, and availability. No known exploits have been reported in the wild yet, but the risk remains significant given the nature of the flaw.

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What to do

Affected software

Description

AI analysisMachine-generated, updated 11 Mar 2026, 20:14 UTC

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