LOW

GHSA-hcc4-c3v8-rx92

AIOHTTP Affected by Denial of Service (DoS) via Unbounded DNS Cache in TCPConnector

Details

### Summary

An unbounded DNS cache could result in excessive memory usage possibly resulting in a DoS situation.

### Impact

If an application makes requests to a very large number of hosts, this could cause the DNS cache to continue growing and slowly use excessive amounts of memory.

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Patch: https://github.com/aio-libs/aiohttp/commit/c4d77c3533122be353b8afca8e8675e3b4cbda98

Are you affected?

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Affected packages

PyPI / aiohttp

Introduced in: 0 Fixed in: 3.13.4

Fix pip install --upgrade 'aiohttp>=3.13.4'

References

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-hcc4-c3v8-rx92 [WEB]
https://nvd.nist.gov/vuln/detail/CVE-2026-34513 [ADVISORY]
https://github.com/aio-libs/aiohttp/commit/c4d77c3533122be353b8afca8e8675e3b4cbda98 [WEB]
https://github.com/aio-libs/aiohttp [PACKAGE]
https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4 [WEB]