What is CVE-2026-54279?

CVE-2026-54279 is a high-severity vulnerability in Aiohttp, classified under Improper Initialization. CVSS score: 7.5/10. Published 2026-06-22.

How severe is CVE-2026-54279?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Aiohttp

CVE-2026-54279

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 vulnera…

Vulnerability class: Dirty Pipe (CVE-2022-0847)

EPSS: 0.003 (20.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Aiohttp
Aio-libs Aiohttp — versions < 3.14.1

Weakness classification (CWE)

CWE-665 — Improper Initialization

References

security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-54279?: CVE-2026-54279 is a high-severity vulnerability in Aiohttp, classified under Improper Initialization. CVSS score: 7.5/10. Published 2026-06-22.
How severe is CVE-2026-54279?: High severity. CVSS v3 base score is 7.5 out of 10.