CVE-2026-87911 Command injection in AWS Labs postgres MCP Server
An attacker can execute OS commands on the host by bypassing read-only SQL validation in the PostgreSQL MCP server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-87911?
CVE-2026-87911 is a critical command injection vulnerability in AWS Labs postgres MCP Server, published on 9 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2026-87911?
How do I fix CVE-2026-87911?
No fix has been published for CVE-2026-87911 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-87911 being exploited?
There is no known exploitation of CVE-2026-87911 in the wild and no public exploit code.