What is CVE-2026-87911?

CVE-2026-87911 is a critical-severity vulnerability in AWS Labs Postgres Mcp Server, classified under OS Command Injection. CVSS score: 9.6/10. Published 2026-09-09.

How severe is CVE-2026-87911?

Critical severity. CVSS v3 base score is 9.6 out of 10.

RCE in AWS Labs Postgres Mcp Server

CVE-2026-87911

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.

Vulnerability class: Command Injection (OS Command Injection)

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

Aws Labs Postgres Mcp Server

Weakness classification (CWE)

References

ff89ba41-3aa1-4d27-914a-91399e9639e5 (patch)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (third-party-advisory)

Frequently asked questions

What is CVE-2026-87911?: CVE-2026-87911 is a critical-severity vulnerability in AWS Labs Postgres Mcp Server, classified under OS Command Injection. CVSS score: 9.6/10. Published 2026-09-09.
How severe is CVE-2026-87911?: Critical severity. CVSS v3 base score is 9.6 out of 10.