CVE-2026-22815

High

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, insufficient restrictions in header/trailer handling could cause uncapped memory usage. This issue has been patched in version 3.13.4.

SeverityHigh

CVSS7.5

Exploit probability—

ProductAiohttp

PublishedApr 1, 2026

First seenApr 1, 2026

Weakness typeCWE-400Uncontrolled resource consumption CWE-770Allocation of resources without limits

How to fix

Update

aiohttp aiohttp3.13.4 or later
aiohttp3.13.4 or later

Affected products

Product	Affected versions	Fixed in
aiohttp aiohttp	v < 3.13.4	3.13.4
aiohttpPyPI	v < 3.13.4	3.13.4

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