CVE-2026-34519 Details
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.
A vulnerability in AIOHTTP, an asynchronous HTTP client/server framework for Python, allows for response header injection. This issue affects AIOHTTP versions through 3.13.3. The vulnerability arises when an attacker controls the 'reason' parameter while creating a response, potentially leading to the injection of extra headers or similar exploits. In applications that use untrusted data in the response's 'reason' parameter, this could result in sending unintended information.
Users can upgrade to AIOHTTP version 3.13.4 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 2, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-113 | Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| aiohttp aiohttp | < 3.13.4 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 16, 2026 | Initial Analysis | [email protected] |
| Apr 1, 2026 | New CVE Received | [email protected] |