Bug 2454096 (CVE-2026-34525) - CVE-2026-34525 aiohttp: aiohttp: Security bypass via multiple Host headers
Summary: CVE-2026-34525 aiohttp: aiohttp: Security bypass via multiple Host headers
Keywords:
Status: NEW
Alias: CVE-2026-34525
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-01 21:02 UTC by OSIDB Bzimport
Modified: 2026-04-01 22:59 UTC (History)
66 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-04-01 21:02:12 UTC 
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.
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