High severity · published Jun 22, 2026
CVE-2026-54279
AIOHTTP: Host-Only Cookies Become Domain Cookies After CookieJar Persistence
7.5
CVSS
0.5%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AI
aiohttp · aio-libs
< 3.14.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-54279
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-54279
Patch
https://github.com/aio-libs/aiohttp/commit/a329a7aacad5284f087af36103aff778746da0f2
Third Party Advisory
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-2fqr-mr3j-6wp8
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