PyPI/aiohttp CVE-2026-22815: high 7.5, EPSS 0.46%

aiohttp allows unlimited trailer headers, leading to possible uncapped memory usage

Action: Upgrade aiohttp to 3.13.4 or later.

pip install aiohttp==3.13.4

Affected

Fixed versions

Sources

• osv: GHSA-w2fm-2cpv-w7v5
• nvd: CVE-2026-22815
• https://github.com/aio-libs/aiohttp/security/advisories/GHSA-w2fm-2cpv-w7v5
• https://github.com/aio-libs/aiohttp/commit/0c2e9da51126238a421568eb7c5b53e5b5d17b36
• https://github.com/aio-libs/aiohttp
• https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4

CVE-2026-22815 · published 2026-04-01T19:45:17Z · modified 2026-09-10T03:51:03.588955358Z · JSON