CVE-2026-5059: Aws mcp Remote Code Execution Vulnerability

CRITICAL
Advisory Identifier: GHSA-fgmx-xfp3-w28p
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CVSS 9.8
CWE-78
Published
Advisory Summary

CVE-2026-5059 is a CRITICAL (CVSS 9.8) remote code execution vulnerability (CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')) affecting Aws mcp libraries in the PyPI ecosystem. The issue involves aws-mcp has a command injection remote code execution vulnerability. Remediation is available in the latest vendor maintenance releases.

CVE-2026-5059 at a Glance

CVE Identifier CVE-2026-5059
GHSA Identifier GHSA-fgmx-xfp3-w28p
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected Product Aws mcp
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 9.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-5059

To remediate this vulnerability, upgrade all affected Aws mcp dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

aws-mcp fixed: Latest secure release 
pip install aws-mcp>=Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show aws-mcp

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-5059, inspect your installed packages using pip:

pip show aws-mcp

Analyze the terminal output to locate any version of Aws mcp in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The pip show aws-mcp command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'), where the product constructs all or part of an os command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended os command when it is sent to a downstream component. In Aws mcp, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2026-5059 Affected Aws mcp Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
aws-mcp
pypi/aws-mcp
PyPI
≤ 1.7.0

References

NVD — CVE-2026-5059 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5059
Aws mcp Source Repository REPOSITORY
https://github.com/alexei-led/aws-mcp-server
www.zerodayinitiative.com/advisories/zdi-26-2... WEB
https://www.zerodayinitiative.com/advisories/ZDI-26-245

Frequently Asked Questions

What is CVE-2026-5059?
CVE-2026-5059 is a security vulnerability in Aws mcp involving aws-mcp has a Command Injection Remote Code Execution Vulnerability under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
Which Aws mcp versions are affected?
Affected versions include releases prior to current release patches across affected packages: aws-mcp.
What version fixes CVE-2026-5059?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is aws-mcp affected?
Yes, aws-mcp is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-5059?
CVE-2026-5059 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-5059?
CVE-2026-5059 is classified under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') (The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.).
How can I check PyPI dependencies for CVE-2026-5059?
Run the dependency tree command: 'pip show aws-mcp'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-fgmx-xfp3-w28p",
  "modified" : "2026-04-14T23:42:39Z",
  "published" : "2026-04-11T03:30:30Z",
  "aliases" : [ "CVE-2026-5059" ],
  "summary" : "aws-mcp has a Command Injection Remote Code Execution Vulnerability",
  "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "aws-mcp"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.7.0"
      } ]
    } ]
  } ],
  "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"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-78" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-14T23:42:39Z",
    "nvd_published_at" : "2026-04-11T01:16:18Z"
  }
}