Host-Only Cookie Vulnerability in AIOHTTP Framework for Python Applications
CVE-2026-54279

1.3LOW

Key Information:

Vendor

Aio-libs

Status
Aiohttp
Vendor
CVE Published:
22 June 2026

What is CVE-2026-54279?

AIOHTTP, the asynchronous HTTP client/server framework for Python, has reported a vulnerability where host-only cookies saved with CookieJar.save() lose their critical host-only status upon being restored with CookieJar.load(). This flaw may expose sensitive cookie data, potentially leading to unauthorized access or session hijacking attacks. The issue has been addressed in version 3.14.1, which ensures that cookies maintain their intended restrictions upon retrieval.

Affected Version(s)

aiohttp < 3.14.1

References

https://github.com/aio-libs/aiohttp/security/advisories/G...
x_refsource_CONFIRM
https://github.com/aio-libs/aiohttp/commit/a329a7aacad528...
x_refsource_MISC

CVSS V4

Score:
1.3
Severity:
LOW
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.