Resource exhaustion in Aio-libs Aiohttp

CVE-2026-34517

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, for some multipart form fields, aiohttp read the entire field into memory before checking client_max_size. This issue has been patched…

EPSS: 0.000 (5.4th percentile) — read the EPSS interpretation.

Affected products

Aio-libs Aiohttp — versions < 3.13.4

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-3wq7-rqq7-wx6j (x_refsource_CONFIRM)
https://github.com/aio-libs/aiohttp/commit/cbb774f38330563422ca0c413a71021d7b944145 (x_refsource_MISC)
https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4 (x_refsource_MISC)