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Python aiohttp: 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. (CVE-2026-54279)

0
Medium
VulnerabilityCVE-2026-54279gcveosvubuntu-cve-2026-54279cve-2026-54279ubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-pro-20-04-ltsubuntu-pro-22-04-ltsubuntu-pro-24-04-ltsubuntu-25-10ubuntu-26-10ubuntu-pro-26-04-lts
Published: 06/22/2026 (06/22/2026, 18:16:00 UTC)
Source: GCVE Database
Product: python-aiohttp

Description

Python aiohttp versions prior to 3.14.1 have a vulnerability where host-only cookies saved with CookieJar.save() lose their host-only status when restored with CookieJar.load(). This issue is fixed in version 3.14.1.

CVSS v3.1

Score 7.5high

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected software

Ubuntu:Pro:16.04:LTSmore threats →ghsa
python-aiohttp
pkg:deb/ubuntu/python-aiohttp?arch=source&distro=esm-apps-legacy/xenial
Affected versions
=0.17.2-1=0.17.4-1=0.17.4-1build1=0.20.2-1=0.20.2-1ubuntu0.1~esm1
Ubuntu:Pro:18.04:LTSmore threats →ghsa
python-aiohttp
pkg:deb/ubuntu/python-aiohttp?arch=source&distro=esm-apps/bionic
Affected versions
=2.2.3-1build1=2.2.3-2=2.3.6-1=3.0.1-1=3.0.1-1ubuntu0.1~esm1=3.0.1-1ubuntu0.1~esm4=3.0.1-1ubuntu0.1~esm5=3.0.1-1ubuntu0.1~esm6=3.0.1-1ubuntu0.1~esm7
Ubuntu:Pro:20.04:LTSmore threats →ghsa
python-aiohttp
pkg:deb/ubuntu/python-aiohttp?arch=source&distro=esm-apps/focal
Affected versions
=3.5.4-1=3.5.4-1build1=3.6.1-1=3.6.2-1=3.6.2-1build1=3.6.2-1ubuntu0.1~esm1=3.6.2-1ubuntu1=3.6.2-1ubuntu1+esm1=3.6.2-1ubuntu1+esm3=3.6.2-1ubuntu1+esm4=3.6.2-1ubuntu1+esm5=3.6.2-1ubuntu1+esm6
Ubuntu:Pro:22.04:LTSmore threats →ghsa
python-aiohttp
pkg:deb/ubuntu/python-aiohttp?arch=source&distro=esm-apps/jammy
Affected versions
=3.7.4-1=3.7.4-1build2=3.8.1-3=3.8.1-4=3.8.1-4build1=3.8.1-4ubuntu0.2=3.8.1-4ubuntu0.2+esm1=3.8.1-4ubuntu0.2+esm2=3.8.1-4ubuntu0.2+esm3
Ubuntu:Pro:24.04:LTSmore threats →ghsa
python-aiohttp
pkg:deb/ubuntu/python-aiohttp?arch=source&distro=esm-apps/noble
Affected versions
=3.8.4-1=3.9.1-1=3.9.1-1build1=3.9.1-1ubuntu0.1=3.9.1-1ubuntu0.1+esm1=3.9.1-1ubuntu0.1+esm2=3.9.1-1ubuntu0.1+esm3
Ubuntu:25.10more threats →ghsa
python-aiohttp
pkg:deb/ubuntu/python-aiohttp?arch=source&distro=questing
Affected versions
=3.10.11-1build1=3.11.16-1=3.11.16-1ubuntu0.1
Ubuntu:26.10more threats →ghsa
python-aiohttp
pkg:deb/ubuntu/python-aiohttp?arch=source&distro=stonking
Affected versions
=3.13.3-3ubuntu1=3.14.1-4=3.14.1-5=3.14.3-1
Ubuntu:Pro:26.04:LTSmore threats →ghsa
python-aiohttp
pkg:deb/ubuntu/python-aiohttp?arch=source&distro=esm-apps/resolute
Affected versions
=3.11.16-1=3.13.1-1=3.13.3-3=3.13.3-3ubuntu1=3.13.3-3ubuntu1+esm1

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 10/18/2026, 00:49:20 UTC

Technical Analysis

The aiohttp asynchronous HTTP client/server framework for Python has a vulnerability identified as CVE-2026-54279. In versions before 3.14.1, host-only cookies that are saved using the CookieJar.save() method and later restored with CookieJar.load() lose their host-only attribute. This behavior could affect cookie handling and potentially impact application behavior relying on cookie security properties. The vulnerability is addressed and fixed in aiohttp version 3.14.1.

Potential Impact

The loss of host-only status on cookies after save and load operations could lead to cookies being sent in contexts where they should not be, potentially affecting application security or behavior. However, the CVSS score of 7.5 with no confidentiality or integrity impact but with high availability impact indicates the primary concern is disruption rather than data compromise.

Mitigation Recommendations

Upgrade aiohttp to version 3.14.1 or later, where this vulnerability is fixed. No other mitigations are specified or necessary as the fix is available.

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Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-54279
Osv Schema Version
1.7.0
Ecosystems
["Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:25.10","Ubuntu:26.10","Ubuntu:Pro:26.04:LTS"]
Cvss Version
3.1
State
PUBLISHED

Threat ID: 6ad3f5fd2cdf04f656663fe8

Added to database: 10/17/2026, 22:26:05 UTC

Last enriched: 10/18/2026, 00:49:20 UTC

Last updated: 10/18/2026, 00:49:20 UTC

Views: 3

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