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.
History

Thu, 02 Apr 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-1286
References
Metrics threat_severity

None

cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'}

threat_severity

Moderate


Wed, 01 Apr 2026 23:45:00 +0000

Type Values Removed Values Added
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.
Title AIOHTTP: HTTP response splitting via \r in reason phrase
Weaknesses CWE-113
References
Metrics cvssV4_0

{'score': 2.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-04-01T20:26:25.553Z

Reserved: 2026-03-30T16:03:31.047Z

Link: CVE-2026-34519

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-04-01T21:17:00.170

Modified: 2026-04-01T21:17:00.170

Link: CVE-2026-34519

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-04-01T20:26:25Z

Links: CVE-2026-34519 - Bugzilla

cve-icon OpenCVE Enrichment

No data.