CVE-2026-34520

CVE Details

Release Date:	2026-04-01
Impact:	Low	What is this?

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.

See more information about CVE-2026-34520 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	3.7
Vector String:	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Version:	3.1
Attack Vector:	Network
Attack Complexity:	High
Privileges Required:	None
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	None
Integrity Impact:	Low
Availability Impact:	None

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (ol-automation-manager)	OLAMSA-2026-0009	2026-04-30
Oracle Linux version 8 (python-aiohttp)	OLAMSA-2026-0009	2026-04-30
Oracle Linux version 8 (python-django)	OLAMSA-2026-0009	2026-04-30
Oracle Linux version 8 (python-galaxy-ng)	OLAMSA-2026-0009	2026-04-30
Oracle Linux version 9 (ol-automation-manager)	OLAMSA-2026-0010	2026-04-30
Oracle Linux version 9 (python-aiohttp)	OLAMSA-2026-0010	2026-04-30
Oracle Linux version 9 (python-django)	OLAMSA-2026-0010	2026-04-30
Oracle Linux version 9 (python-galaxy-ng)	OLAMSA-2026-0010	2026-04-30