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CVE-2026-34513

High

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, an unbounded DNS cache could result in excessive memory usage possibly resulting in a DoS situation. 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-770Allocation of resources without limits

How to fix

Update
  • aiohttp aiohttp3.13.4 or later
  • aiohttp3.13.4 or later

Affected products

ProductAffected versionsFixed in
aiohttp aiohttpv < 3.13.43.13.4
aiohttpPyPIv < 3.13.43.13.4

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