CVE-2026-34520

CriticalCVSS 9.1/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 9.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Weakness enumeration

CWE-113

Affected software

No affected versions have been published.

Timeline

Published: Apr 1, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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