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CVE-2026-34519

Published: Apr 1, 2026

Modified: Apr 2, 2026

PUBLISHED

Description

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.

Vendor	Product	Versions
aio-libs	aiohttp	affected `< 3.13.4`

Weaknesses (CWE)

References

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mwh4-6h8g-pg8w

x_refsource_CONFIRM

https://github.com/aio-libs/aiohttp/commit/53b35a2f8869c37a133e60bf1a82a1c01642ba2b

x_refsource_MISC

https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4

x_refsource_MISC

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