High · published January 6, 2026
⚠️ An infinite loop is waiting to trip you up! A crafted POST message could send your AIOHTTP application spiraling into a denial-of-service attack, especially if you're using older versions. 😱 Think of it like a restaurant where a customer keeps sending back the same dish over and over. If the kitchen doesn’t handle it properly, they can’t serve any new customers, causing a complete service breakdown! If an attacker exploits this vulnerability, they could force your server into an unresponsive state, preventing legitimate users from accessing your services. This could lead to frustration and lost business, especially during peak times — and nobody likes a hungry crowd waiting at the door!
Think of it like a restaurant where a customer keeps sending back the same dish over and over. If the kitchen doesn’t handle it properly, they can’t serve any new customers, causing a complete service breakdown! This vulnerability arises in AIOHTTP versions 3.13.2 and below, where bypassing assert statements can lead to an infinite loop when processing a POST body. This situation can become critical when optimizations are enabled, allowing attackers to effectively execute a denial-of-service attack.
If an attacker exploits this vulnerability, they could force your server into an unresponsive state, preventing legitimate users from accessing your services. This could lead to frustration and lost business, especially during peak times — and nobody likes a hungry crowd waiting at the door! To protect your application, immediately upgrade AIOHTTP to version 3.13.3 or later. Review how you handle POST requests and consider adding input validation to mitigate similar issues in the future. You've got this — with a quick patch, your AIOHTTP application can stay up and running smoothly! 🛡️
| Product | Versions | Fixed in |
|---|---|---|
| aiohttp/aiohttp | < 3.13.3 | 3.13.3 |