How to fix EUVD-2026-21655?

Within 24 hours: Identify all systems running aws-mcp-server and take inventory of network exposure (internal vs. internet-facing). Immediately restrict network access to aws-mcp-server using firewall rules to limit connectivity to only essential trusted systems. Within 7 days: Implement network segmentation to isolate aws-mcp-server from production systems; consider disabling the service entirely if not operationally critical. Monitor AWS MCP project and vendor advisory channels for patch releases. Within 30 days: Upon availability of patched aws-mcp-server version, test thoroughly in non-production environment before deploying to production infrastructure.

Is Command Injection affected by EUVD-2026-21655?

CVE-2026-5058 is a critical command injection vulnerability in aws-mcp-server that allows unauthenticated attackers to execute arbitrary code remotely on systems running the affected server.

EUVD-2026-21655

| CVE-2026-5058 CRITICAL

2026-04-11 zdi

GHSA-fjwc-hc62-p8h9

9.8

CVSS 3.0

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Apr 11, 2026 - 01:00 vuln.today

EUVD ID Assigned

Apr 11, 2026 - 01:00 euvd

EUVD-2026-21655

CVE Published

Apr 11, 2026 - 00:14 nvd

CRITICAL 9.8

Description

aws-mcp-server Command Injection Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of aws-mcp-server. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of the allowed commands list. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of the MCP server. Was ZDI-CAN-27968.

Analysis

Remote code execution in aws-mcp-server 1.3.0 allows unauthenticated attackers to execute arbitrary commands via improper validation of the allowed commands list. The command injection flaw (CWE-78) enables system call execution without authentication barriers. …

Remediation

Within 24 hours: Identify all systems running aws-mcp-server and take inventory of network exposure (internal vs. internet-facing). …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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Priority Score

Low Medium High Critical

KEV: 0

EPSS: +1.0

CVSS: +49

POC: 0

EUVD-2026-21655 vulnerability details – vuln.today

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EUVD-2026-21655

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EUVD-2026-21655

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