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PYSEC-2026-1103 aiohttp allows request smuggling due to incorrect parsing of chunk extensions

🗓️ 07 Jul 2026 14:34:45Reported by GoogleType 
osv
 osv🔗 osv.dev👁 5 Views

Aiohttp permits request smuggling due to bad chunk extension parsing, especially in pure Python builds.

Related
Refs
ReporterTitlePublishedViews
Family
IBM Security Bulletins		Security Bulletin: Multiple Vulnerabilities in IBM API Connect
15 Mar 202500:18
–ibm
IBM Security Bulletins		Security Bulletin: There is a vulnerability in Python wheel package for the aiohttp library affecting watsonx Code Assistant On Prem Extensions
27 Mar 202515:42
–ibm
IBM Security Bulletins		Security Bulletin: IBM Maximo Application Suite Predict Component uses CVE-2024-52304 (Low) detected in aiohttp-3.9.2-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl which is vulnerable to CVE-2024-52304
20 Feb 202506:08
–ibm
IBM Security Bulletins		Security Bulletin: IBM Maximo Application Suite Ai-Broker Component uses CVE-2024-52304 aiohttp-3.10.2-cp310-cp310-macosx_10_9_universal2.whl (Publicly disclosed vulnerability found by Mend) CVE-2024-52304
28 Jan 202521:51
–ibm
IBM Security Bulletins		Security Bulletin: Vulnerability in aiohttp affects IBM watsonx Assistant Cartridge and IBM watsonx Orchestrate with watsonx Assistant Cartridge.
14 May 202519:21
–ibm
Tenable Nessus		aioHTTP < 3.10.11 Request Smuggling
20 Nov 202400:00
–nessus
Tenable Nessus		Debian dla-4041 : python-aiohttp-doc - security update
3 Feb 202500:00
–nessus
Tenable Nessus		Debian dsa-5828 : python-aiohttp-doc - security update
11 Dec 202400:00
–nessus
Tenable Nessus		Fedora 40 : python-aiohttp (2024-04ceb82dc7)
28 Nov 202400:00
–nessus
Tenable Nessus		Fedora 41 : python-aiohttp (2024-49df7093ac)
28 Nov 202400:00
–nessus
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07 Jul 2026 17:46Current
7.2High risk
Vulners AI Score7.2
CVSS 46.3
EPSS0.00576
aiohttprequest smugglingchunk extension parsingpure python buildsextensions disabled
5