CVE-2026-54277
High
Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, it is possible to bypass the max_line_size check in parts of an HTTP request in the C parser. If using the optimised C parser (the default in pre-built wheels), then an attacker may be able to send oversized lines through the HTTP parser and use an excessive amount of memory, potentially leading to DoS. This vulnerability is fixed in 3.14.1.
SeverityHigh
CVSS7.5
Exploit probability—
ProductAiohttp
PublishedJun 22, 2026
First seenJun 22, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Update
- aiohttp aiohttp3.14.1 or later
- aiohttp3.14.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| aiohttp aiohttp | v < 3.14.1 | 3.14.1 |
| aiohttpPyPI | v < 3.14.1 | 3.14.1 |
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