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AIOHTTP is vulnerable to HTTP Request/Response Smuggling through incorrect parsing of chunked trailer sections

🗓️ 07 Jul 2026 16:02:58Reported by Python Packaging AdvisoryType 
pypa
 pypa🔗 github.com👁 7 Views

Aiohttp vulnerable to request smuggling due to improper parsing of trailer sections in Python parser.

Related
Detection
Refs
ReporterTitlePublishedViews
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14 Jan 202612:11
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IBM Security Bulletins		Security Bulletin: IBM Maximo Application Suite Ai-Service Component uses AIOHTTP asynchronous Python parser which is vulnerable to CVE-2025-53643.
23 Sep 202507:22
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28 Aug 202507:21
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IBM Security Bulletins		Security Bulletin: Vulnerability in AIOHTTP affects IBM watsonx Assistant Cartridge and IBM watsonx Orchestrate with watsonx Assistant Cartridge.
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IBM Security Bulletins		Security Bulletin: Multiple security vulnerabilities are addressed with IBM Process Mining Interim Fix for Aug 2025
29 Aug 202510:45
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Tenable Nessus		aioHTTP < 3.12.14 Request Smuggling (CVE-2025-53643)
18 Jul 202500:00
–nessus
Rows per page
Vulners
Node
pypiaiohttpRange0–3.12.14

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07 Jul 2026 17:23Current
6Medium risk
Vulners AI Score6
CVSS 46.3
CVSS 3.17.5
EPSS0.00297
SSVC
Aiohttp vulnerabilityRequest smugglingTrailer parsingPython parser
7