Medium [CVE-2026-54279] Host-Only Cookies Become Domain Cookies After CookieJar Persistence
This medium-severity Red Hat Linux advisory covers CVE-2026-54279.
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Summary
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, host-only cookies that are saved with CookieJar.save() and then restored later with CookieJar.load() lose their host-only status.
This vulnerability is fixed in 3.14.1. A flaw was found in aiohttp (before 3.14.1). aiohttp is vulnerable to improper cookie scope handling when persisting and reloading CookieJar data.
After save/load, host-only cookies are treated as domain cookies, so session data meant for one host may be sent to subdomains on subsequent requests. Red Hat exposure is in Python asyncio services that bundle aiohttp and persist cookie jars to disk, including AI inference, AAP, and other hybrid platform Python containers.
Red Hat severity: Low — CVSS 4.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N). Weakness: CWE-565.
Red Hat lists Exploit Intelligence; Migration Toolkit for Applications 8; OpenShift Lightspeed; Red Hat AI Inference Server; Red Hat Ansible Automation Platform 2; Red Hat Ansible Automation Platform Ansible Core 2; Red Hat Discovery 2; Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat Hardened Images; Red Hat OpenShift AI (RHOAI); Red Hat Satellite 6; Red Hat Update Infrastructure 4 for Cloud Providers as not affected.
- < 3.14.1
Official advisory · high-confidence parse· fetched 15 days ago·verify at source
Mitigation
Upgrade to a fixed release: 3.14.1. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 15 days ago·verify at source
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