PYSEC-2026-2101

vendorUSosv

view advisory published 2026-04-01Licence: CC-BY-4.0

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, an attacker who controls the reason parameter when creating a Response may be able to inject extra headers or similar exploits. This issue has been patched in version 3.13.4.

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2026-34519US	medium5.3	0.29% (22nd)	—	2026-04-01
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, an attacker who controls the reason parameter when creating a Response may…

references

External citations — patches, advisories, analysis.

https://github.com/aio-libs/aiohttp/commit/53b35a2f8869c37a133e60bf1a82a1c01642ba2bFIX
https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4ADVISORY
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mwh4-6h8g-pg8wFIX

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