CVE-2026-22815AIOHTTP: Uncapped memory usage possible through aiohttp allowing unlimited trailer headers

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.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://github.com/aio-libs/aiohttp/security/advisories/GHSA-w2fm-2cpv-w7v5 PatchVendor Advisory
• https://github.com/aio-libs/aiohttp/commit/0c2e9da51126238a421568eb7c5b53e5b5d17b36 Patch
• https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4 Release Notes