PYSEC-2026-2095

At a glance

Published: 2026-04-01 21:16 UTC
Updated: 2026-07-13 07:15 UTC
CVE: CVE-2026-34513
Aliases: GHSA-hcc4-c3v8-rx92
CVSS_V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Affected packages

Package	Versions
PyPI · aiohttp	introduced 0, fixed 3.13.4

References

https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4 ADVISORY
https://github.com/aio-libs/aiohttp/commit/c4d77c3533122be353b8afca8e8675e3b4cbda98 FIX
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-hcc4-c3v8-rx92 FIX

Sources

Source	Licence
OSV.dev	CC-BY 4.0 — PyPA Advisory Database