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CVE-2026-5059

CriticalPublished

aws-mcp-server AWS CLI Command Injection Remote Code Execution Vulnerability

Published: Apr 11, 2026
Updated: Apr 13, 2026
Assigning CNA: zdi
Evidence observed: Aug 25, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.0

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

EPSS probability estimate

1.9%

Low · next 30 days

Percentile: 78.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

aws-mcp-server AWS CLI 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-27969.

Sources

CVE-2026-5059-pocPoC
Proof-of-concept for CVE-2026-5059, a command injection in aws-mcp-server via shell=True and incomplete validation, with vulnerable and patched code analysis.
CVE-2026-5059-pocPoC
Proof-of-concept demonstrating command injection in aws-mcp-server via shell=True, with analysis of the vulnerable code and the fix in v1.7.0.

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