CVE-2026-34519
MEDIUM WAF: High
CVSS 5.3
Published: 2026-04-01
CWE-113
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.
WAF Coverage Analysis
HTTP Response Splitting
High WAF Coverage
OWASP: A03:2021 Injection
921xxx - Protocol Attack
Affected Software
| Vendor | Product | Version |
|---|---|---|
| aiohttp | aiohttp | up to 3.13.4 |
References
- github.com (Patch)
- github.com (Release Notes)
- github.com (Patch, Vendor Advisory)