PyPI/aiohttp CVE-2026-54278: high 7.5, EPSS 0.49%

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, during cleanup it is possible for a compressed request body to be decompressed into memory in one chunk

Action: Upgrade aiohttp to 3.14.1 or later.

pip install aiohttp==3.14.1

Affected

Fixed versions

Sources

• osv: PYSEC-2026-2111
• https://github.com/aio-libs/aiohttp/security/advisories/GHSA-g3cq-j2xw-wf74
• https://github.com/aio-libs/aiohttp/commit/4f7480e474cccc6a8cc2c92ad3f17a31dedf8232

CVE-2026-54278 · published 2026-06-22T18:16:46.393Z · modified 2026-07-13T07:15:14.301970035Z · JSON