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AWS MCP Server Vulnerable to Command Injection via PostgreSQL

By PulseAugur Editorial · [1 sources] ·

A critical command injection vulnerability, CVE-2026-87911, has been discovered in AWS's postgres-mcp-server, allowing attackers to execute arbitrary operating system commands. The flaw, which has a CVSS score of 9.6, lies in the server's handling of the `COPY ... TO PROGRAM` PostgreSQL command. While the fix has been available on PyPI since June, it went largely unnoticed until the AWS advisory was published. The vulnerability affects self-managed PostgreSQL instances where the database role has superuser privileges or is a member of `pg_execute_server_program`, as read-only transactions do not prevent this type of command execution. AI

IMPACT This vulnerability highlights the critical need for robust security in AI-powered tools that interact with databases, potentially impacting the adoption of such systems.

RANK_REASON The article details a vulnerability in a specific AWS product, the postgres-mcp-server, which is a tool for translating natural language to SQL.

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

AWS MCP Server Vulnerable to Command Injection via PostgreSQL

How we ranked this

Signal score
17 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
The article details a vulnerability in a specific AWS product, the postgres-mcp-server, which is a tool for translating natural language to SQL.
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
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product, safety
Editorial topic classification. Feeds into how the story surfaces on /topic/<slug> hub pages and into the per-entity coverage mix.
AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
Breaking (< 6h)
Fresh story with cross-source coverage still developing. Ranking may shift as more sources report.

Full methodology in our editorial standards.

COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · Kiell Tampubolon ·

    Read-Only Postgres MCP Servers Fail With 1 SQL Keyword

    <p>Your MCP server says read-only. In the past six days that promise broke three separate times in Postgres-land, and the newest one ends in a shell.</p> <p>On September 9, AWS published CVE-2026-87911: a CVSS 9.6 command injection in the read-only enforcement of its own postgres…

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