CVE-2026-111749CWE-565

CVE-2026-111749

published October 19, 2026

CVSS
2.3
EPSS
0%
Percentile
20.9
In the wild
Unconfirmed
What it is

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, Host-Only scope on an existing parent-domain cookie can be removed by a subdomain. A user who accesses an untrusted subdomain can consequently have host-only protections stripped from cookies, although impact is limited when applications do not reflect those cookies to a browser. This issue is fixed in version 3.14.4.

The record
Technical detail
CVSS
2.3 · NONE
CVSS v4.0
2.3 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00294 · 20.9th percentile
Weakness
CWE-565 · Reliance on Cookies without Validation and Integrity Checking
Published
2026-10-19T21:17Z
References (3)
https://github.com/aio-libs/aiohttp/commit/6a07c171ef9f3be583e2907dcd1931372efca8d6 · [email protected]https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4 · [email protected]https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gx76-c99x-2c96 · [email protected]
EPSS history
Timeline
  • 21 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 19 OCT 17:04Z
    AIOHTTP: Cookie from subdomain can remove Host-Only Scope from existing cookies
    cvelistv5
  • 19 OCT 17:04Z
    AIOHTTP: Cookie from subdomain can remove Host-Only Scope from existing cookies
    cvelistv5