Vulnerability · Published Jun 22, 2026 · Assigned by GitHub_M
CVE-2026-54279AIOHTTP: Host-Only Cookies Become Domain Cookies After CookieJar Persistence
Low 1.3
In plain English
A low-severity security flaw in aiohttp from aio-libs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)1.3Low
Exploit odds (30 days)0.5%top 57.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | python-aiohttp | 3.8.4-1+deb12u2 | DEBIAN-CVE-2026-54279 |
| Debian:13 | python-aiohttp | no fix listed | DEBIAN-CVE-2026-54279 |
| Debian:14 | python-aiohttp | 3.14.1-1 | DEBIAN-CVE-2026-54279 |
| PyPI | aiohttp | 3.14.1 | PYSEC-2026-2112 |
| PyPI | aiohttp | 3.14.1 | GHSA-2fqr-mr3j-6wp8 |
| Ubuntu:25.10 | python-aiohttp | no fix listed | UBUNTU-CVE-2026-54279 |
| Ubuntu:26.10 | python-aiohttp | no fix listed | UBUNTU-CVE-2026-54279 |
Affected products (as reported)
Weakness: CWE-665 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N/E:U