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CVE-2026-87911— Read-only enforcement bypass enabling operating system command execution in the SQL validation component of Amazon awslabs postgres-mcp-server

Quick assessment

Affected
AWS AWS Labs postgres MCP Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Amazon Open source MCP servers for AWS是美国Amazon公司的一款亚马逊云服务连接的模块集合。 Amazon Open source MCP servers for AWS 1.1.7之前版本存在安全漏洞，该漏洞源于SQL验证组件只读强制实施中的OS命令注入缺陷，未经身份验证的攻击者可通过特制的COPY ... TO PROGRAM语句，在自管理PostgreSQL服务器主机上执行操作系统命令。

CVSS 9.6 · Critical EPSS 1.74% · P78

Possible ATT&CK Techniques 1 AI

T1059.004 · Unix Shell

Affected Version Matrix 1

VendorProduct Version RangeStatus
AWS AWS Labs postgres MCP Server < 1.1.7 affected
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I. Basic Information for CVE-2026-87911

Vulnerability Information
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Vulnerability Title
Read-only enforcement bypass enabling operating system command execution in the SQL validation component of Amazon awslabs postgres-mcp-server
Source: CVE Program / CVE List V5
Vulnerability Description
An OS command injection weakness in the read-only enforcement of the SQL validation component in Amazon awslabs postgres-mcp-server before 1.1.7 might allow an unauthenticated actor to execute operating system commands on the host of a self-managed PostgreSQL server by placing a crafted COPY ... TO PROGRAM statement into content that is processed when an authenticated user interacts with the MCP server in its default read-only mode. To remediate this issue, users should upgrade to version 1.1.7 or later.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Amazon Open source MCP servers for AWS 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Amazon Open source MCP servers for AWS是美国Amazon公司的一款亚马逊云服务连接的模块集合。 Amazon Open source MCP servers for AWS 1.1.7之前版本存在安全漏洞，该漏洞源于SQL验证组件只读强制实施中的OS命令注入缺陷，未经身份验证的攻击者可通过特制的COPY ... TO PROGRAM语句，在自管理PostgreSQL服务器主机上执行操作系统命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS AWS Labs postgres MCP Server 0 ~ 1.1.7 -

II. Public POCs for CVE-2026-87911

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III. Intelligence Information for CVE-2026-87911

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Vendor Advisories for CVE-2026-87911 (2)

Vendor Pages for CVE-2026-87911 (1)

IV. Related Vulnerabilities

Same vendor: AWS
Same weakness: CWE-78