PyPI/aiohttp CVE-2026-34520: unknown, EPSS 0.68%
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, the C parser (the default for most installs) accepted null bytes and control characters in resp
Action: Upgrade aiohttp to 3.13.4 or later.
pip install aiohttp==3.13.4Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 3.13.4 | - |
Fixed versions
| 3.13.4 |
Sources
- osv: PYSEC-2026-2102
- https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4
- https://github.com/aio-libs/aiohttp/commit/9370b9714a7a56003cacd31a9b4ae16eab109ba4
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-63hf-3vf5-4wqf
CVE-2026-34520 · published · modified · JSON