CVE-2026-34519
HTTP Header Injection Vulnerability in AIOHTTP Response Component
Publication date: 2026-04-01
Last updated on: 2026-04-16
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| aiohttp | aiohttp | to 3.13.4 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-113 | The product receives data from an HTTP agent/component (e.g., web server, proxy, browser, etc.), but it does not neutralize or incorrectly neutralizes CR and LF characters before the data is included in outgoing HTTP headers. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in the AIOHTTP framework prior to version 3.13.4. It allows an attacker who controls the 'reason' parameter when creating a Response to potentially inject extra HTTP headers or perform similar exploits.
How can this vulnerability impact me? :
The vulnerability can allow an attacker to inject additional HTTP headers into responses. This could lead to security issues such as header injection attacks, which might be used to manipulate client behavior, bypass security controls, or conduct other malicious activities.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, you should upgrade AIOHTTP to version 3.13.4 or later, where the issue has been patched.