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VULNERABILITIES

CVE-2026-4270 Details

Description

Improper Protection of Alternate Path exists in the no-access and workdir feature of the AWS API MCP Server versions >= 0.2.14 and < 1.3.9 on all platforms may allow the bypass of intended file access restriction and expose arbitrary local file contents in the MCP client application context. To remediate this issue, users should upgrade to version 1.3.9.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: AMZNCVSS-B:5.5 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://aws.amazon.com/security/security-bulletins/2026-007-AWS/ AMZNVendor Advisory
https://pypi.org/project/awslabs.aws-api-mcp-server/1.3.9/ AMZNThird Party Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-424Improper Protection of Alternate PathAMZN

Affected Products

ProductVersions
amazon aws api mcp server
>= 0.2.14, < 1.3.9

CPE

  • cpe:2.3:a:amazon:aws_api_mcp_server:*:*:*:*:*:python:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-4270
NVD Published Date:
Mar 16, 2026
NVD Last Modified:
Jun 17, 2026
Source:
AMZN
CVE-2026-4270 Details - Not Deferred