An OS AWS Enterprise Services is affected by CVE-2026-87911, rated 9 (critical). No in-the-wild exploitation has been confirmed in the CISA KEV catalog at the time of writing.
What the flaw is
The NIST National Vulnerability Database describes it as follows:
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.
At a glance
| Field | Detail |
|---|---|
| CVE | CVE-2026-87911 |
| Affected product | An OS AWS Enterprise Services |
| Weakness | CWE-78 (OS Command Injection) |
| CVSS | 9 CRITICAL — CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
What defenders should do
- Patch: apply the fixed release from An OS; check the vendor advisory linked below for the exact versions.
- Inventory: identify every instance of An OS AWS Enterprise Services, prioritising internet-facing ones.
