EUVD-2026-18048
GHSA-c427-h43c-vf67
6.3
CVSS 4.0
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CVSS Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
X
Lifecycle Timeline
4
Patch Released
Apr 02, 2026 - 02:30 nvd
Patch available
Analysis Generated
Apr 01, 2026 - 21:00 vuln.today
EUVD ID Assigned
Apr 01, 2026 - 21:00 euvd
EUVD-2026-18048
CVE Published
Apr 01, 2026 - 20:28 nvd
MEDIUM 6.3
Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, multiple Host headers were allowed in aiohttp. This issue has been patched in version 3.13.4.
Analysis
AIOHTTP prior to version 3.13.4 allows multiple Host headers in HTTP requests, enabling information disclosure through header injection attacks. An unauthenticated remote attacker can exploit this by crafting malicious requests with duplicate Host headers to potentially bypass security controls or extract sensitive information from affected applications. …
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Priority Score
32
Low
Medium
High
Critical
KEV: 0
EPSS: +0.1
CVSS: +32
POC: 0
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External POC / Exploit Code
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