CVE-2025-53643 — HTTP Request Smuggling in Aiohttp
Severity
1.7LOWNVD
EPSS
0.1%
top 75.14%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedJul 14
Latest updateJan 15
Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.12.14, the Python parser is vulnerable to a request smuggling vulnerability due to not parsing trailer sections of an HTTP request. 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. Version 3.12.14 contains a p…
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Affected Packages3 packages
Patches
🔴Vulnerability Details
4CVEList▶
AIOHTTP is vulnerable to HTTP Request/Response Smuggling through incorrect parsing of chunked trailer sections↗2025-07-14
GHSA▶
AIOHTTP is vulnerable to HTTP Request/Response Smuggling through incorrect parsing of chunked trailer sections↗2025-07-14
OSV▶
CVE-2025-53643: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python↗2025-07-14
OSV▶
AIOHTTP is vulnerable to HTTP Request/Response Smuggling through incorrect parsing of chunked trailer sections↗2025-07-14