Bug 2555717 (CVE-2026-111749) - CVE-2026-111749 aiohttp: aiohttp: Host-Only cookie protection bypass via untrusted subdomain
Summary: CVE-2026-111749 aiohttp: aiohttp: Host-Only cookie protection bypass via untr...
Keywords:
Status: NEW
Alias: CVE-2026-111749
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: 2026-10-19 17:22 UTC by OSIDB Bzimport
Modified: 2026-11-03 08:30 UTC (History)
78 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-10-19 17:22:50 UTC 
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, Host-Only scope on an existing parent-domain cookie can be removed by a subdomain. A user who accesses an untrusted subdomain can consequently have host-only protections stripped from cookies, although impact is limited when applications do not reflect those cookies to a browser. This issue is fixed in version 3.14.4.
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