---
id: CVE-2026-87911
title: >-
  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 s…
summary: >-
  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 s…
severity: critical
cvss: 9.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H'
cwe:
  - CWE-78
  - CWE-184
vendor: AWS
product: AWS Labs postgres MCP Server
affected:
  - labs_postgres_mcp_server < 1.1.7
published: '2026-09-09'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T15:53:23.707'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87911'
references:
  - url: 'https://aws.amazon.com/security/security-bulletins/2026-104-aws/'
    label: ff89ba41-3aa1-4d27-914a-91399e9639e5
  - url: 'https://github.com/awslabs/mcp/security/advisories/GHSA-fph8-pg5w-78fv'
    label: ff89ba41-3aa1-4d27-914a-91399e9639e5
  - url: 'https://pypi.org/project/awslabs.postgres-mcp-server/1.1.7/'
    label: ff89ba41-3aa1-4d27-914a-91399e9639e5
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-10T13:53:17.650302Z'
ingestedAt: '2026-09-13T19:02:50.753Z'
epss: 0.01738
epssPercentile: 0.76728
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.