HTTP Request Smuggling Affecting aiohttp package, versions [,3.12.14)
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- published15 Jul 2025
- disclosed14 Jul 2025
- creditJeppe Bonde Weikop
Introduced: 14 Jul 2025
NewCVE-2025-53643 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade aiohttp to version 3.12.14 or higher.
Overview
Affected versions of this package are vulnerable to HTTP Request Smuggling via incorrect parsing of the trailer section in HTTP requests. An attacker can bypass firewall or proxy protections by crafting specially formed HTTP requests.
Note:
This is exploitable if the pure Python version of aiohttp is installed or the AIOHTTP_NO_EXTENSIONS environment variable is enabled.