AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below of the Python HTTP parser may allow a request smuggling attack with the presence of non-ASCII characters. If a pure Python version of AIOHTTP is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. This issue is fixed in version 3.13.3.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade py3-aiohttp | Jan 13, 2026 | Jan 5, 2026 |
| Debian | — | Upgrade python-aiohttp | Jun 2, 2026 | Jun 2, 2026 |
| Splunk | — | Upgrade Splunk Enterprise to version 10.2.1Upgrade Splunk Enterprise to version 9.3.10Upgrade Splunk Enterprise to version 9.4.9Upgrade Splunk Enterprise to version 10.0.4 | Jul 30, 2026 | Jan 5, 2026 |
| Ubuntu | — | Upgrade python3-aiohttp (Ubuntu Pro)Upgrade python3-aiohttp | Feb 17, 2026 | Jan 5, 2026 |
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