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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.

以下是该漏洞描述和修复建议的中文翻译： 漏洞描述： 在 Amazon awslabs postgres-mcp-server 1.1.7 之前版本中，SQL 验证组件在只读模式下的执行存在操作系统命令注入缺陷。一个未经身份验证的攻击者，可以通过在内容中植入一个精心构造的 语句，当已认证用户以默认只读模式与 MCP 服务器交互时，可在自管 PostgreSQL 服务器的主机上执行操作系统命令。 修复建议： 为修复此问题，用户应升级到 1.1.7 或更高版本。

CVSS 9.6 · Critical EPSS 0.99% · P60

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

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

V. Comments for CVE-2026-87911

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