Critical severity9.6NVD Advisory· Published Sep 9, 2026

CVE-2026-87911

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.

Affected products

Pypi/Awslabs.postgres Mcp Serverreferences
Package: https://pypi.org/project/awslabs.postgres-mcp-server
Amazon/postgres-mcp-serverllm-fuzzy
Range: <1.1.7
Awslabs/Mcpllm-fuzzy
Range: <1.1.7

Patches

Vulnerability mechanics

References

aws.amazon.com/security/security-bulletins/2026-104-aws/nvd
github.com/awslabs/mcp/security/advisories/GHSA-fph8-pg5w-78fvnvd
pypi.org/project/awslabs.postgres-mcp-server/1.1.7/nvd

News mentions

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cvss	0.624
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000