CVE-2026-54279: CWE-665: Improper Initialization in aio-libs aiohttp
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.
AI Analysis
Technical Summary
The vulnerability in aiohttp (CVE-2026-54279) involves improper initialization related to host-only cookies. Specifically, when host-only cookies are saved using CookieJar.save() and later restored with CookieJar.load(), they lose their host-only attribute in versions before 3.14.1. This could affect cookie handling behavior in applications using aiohttp. The issue is addressed in version 3.14.1.
Potential Impact
The improper handling of host-only cookies may lead to cookies being treated as less restrictive than intended, potentially allowing cookies to be sent in contexts where they should not be. However, the CVSS score of 1.3 and the low severity rating indicate the impact is minimal and does not involve privilege escalation, authentication bypass, or direct compromise.
Mitigation Recommendations
Upgrade aiohttp to version 3.14.1 or later, where this vulnerability is fixed. No other mitigation or temporary workaround is indicated.
CVE-2026-54279: CWE-665: Improper Initialization in aio-libs aiohttp
Description
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.
CVSS v4.0
Score 1.3low
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in aiohttp (CVE-2026-54279) involves improper initialization related to host-only cookies. Specifically, when host-only cookies are saved using CookieJar.save() and later restored with CookieJar.load(), they lose their host-only attribute in versions before 3.14.1. This could affect cookie handling behavior in applications using aiohttp. The issue is addressed in version 3.14.1.
Potential Impact
The improper handling of host-only cookies may lead to cookies being treated as less restrictive than intended, potentially allowing cookies to be sent in contexts where they should not be. However, the CVSS score of 1.3 and the low severity rating indicate the impact is minimal and does not involve privilege escalation, authentication bypass, or direct compromise.
Mitigation Recommendations
Upgrade aiohttp to version 3.14.1 or later, where this vulnerability is fixed. No other mitigation or temporary workaround is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-12T17:13:32.280Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a39735ceed863c81e396293
Added to database: 06/22/2026, 17:39:40 UTC
Last enriched: 06/22/2026, 17:55:23 UTC
Last updated: 06/22/2026, 19:09:21 UTC
Views: 2
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