HTTP Request Smuggling Affecting aiohttp package, versions [,3.13.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published6 Jan 2026
- disclosed5 Jan 2026
- creditThomas
Introduced: 5 Jan 2026
CVE-2025-69224 (opens in a new tab)How to fix?
Upgrade aiohttp to version 3.13.3 or higher.
Overview
Affected versions of this package are vulnerable to HTTP Request Smuggling via the unicode processing of HTTP header values. An attacker can bypass firewall or proxy protections by sending requests containing non-ASCII characters.
Note: This is only exploitable if C extensions are not in use (pure python installation) or if the AIOHTTP_NO_EXTENSIONS environment variable is enabled.