PYSEC-2026-288

Vulnerability from pysec - Published: 2026-06-29 11:50 - Updated: 2026-07-01 20:22
VLAI
Details

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.

Impacted products
Name purl
aws-mcp pkg:pypi/aws-mcp

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "aws-mcp",
        "purl": "pkg:pypi/aws-mcp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.7.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.4",
        "1.5.5",
        "1.5.6",
        "1.6.0",
        "1.7.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-5059",
    "GHSA-fgmx-xfp3-w28p"
  ],
  "details": "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.\n\nThe 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.",
  "id": "PYSEC-2026-288",
  "modified": "2026-07-01T20:22:49.598545Z",
  "published": "2026-06-29T11:50:47.676407Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5059"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/alexei-led/aws-mcp-server"
    },
    {
      "type": "WEB",
      "url": "https://www.zerodayinitiative.com/advisories/ZDI-26-245"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/aws-mcp"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-fgmx-xfp3-w28p"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "aws-mcp has a Command Injection Remote Code Execution Vulnerability"
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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