# Ubuntu security advisory addresses asyncpg vulnerability allowing remote code execution

> **Key takeaway:** A flaw in how asyncpg processes PostgreSQL array data can lead to denial of service or arbitrary code execution by a malicious server.

**Published:** 2026-11-11T18:31:31+00:00 
**Source:** Ubuntu Security & Release Notices 
**Category:** distro-news 
**Canonical URL:** https://fosswire.org/news/ubuntu-security-advisory-addresses-asyncpg-vulnerability-all.html 

## Summary
Canonical has issued a security notice regarding a vulnerability in the asyncpg Python library, which is used for asynchronous database communication with PostgreSQL. The issue stems from incorrect handling of specific array data types returned by a PostgreSQL server.

This vulnerability affects users running asyncpg on Ubuntu systems where the library interacts with a potentially compromised or malicious database server. An attacker who controls the PostgreSQL server can exploit this flaw to trigger application crashes or achieve arbitrary code execution on the client side.

## Technical details of the asyncpg flaw
- **Defect Class:** The vulnerability involves improper handling of data structures, specifically regarding array data returned from the database.
- **Attack Vector:** A remote attacker can exploit this by controlling the PostgreSQL server that the asyncpg client is connected to.
- **Impact:** Successful exploitation can result in a denial of service (DoS) via application crashes or the execution of arbitrary code.
- **Affected Component:** The asyncpg library's data parsing logic for PostgreSQL array responses.

## Why it matters
This advisory is critical for developers and system administrators building asynchronous Python applications that rely on PostgreSQL. Because the threat model involves a malicious server, it highlights the importance of securing database environments to prevent client-side compromise in distributed architectures.