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CVE-2026-34520

CRITICAL CVSS: 9.1 Published: 2026-04-01 Modified: 2026-06-17

Description

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 response headers. This issue has been patched in version 3.13.4.

Affected Platforms

Aiohttp Aiohttp

Weakness Type

CWE-113

References