aio-libs/aiohttp · Security
AIOHTTP: Cookie from subdomain can remove Host-Only Scope from existing cookies
- GHSA ID
- GHSA-gx76-c99x-2c96
- CVE ID
- CVE-2026-111749
- Severity
- low
- Published
- Updated
- CVSS v4
- 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
Description
Summary
A subdomain can remove the Host-Only flag from an existing cookie to a parent domain.
Impact
A user accessing untrusted subdomains could see their Host-Only protections stripped from cookies. Given most usecases won't reflect these cookies to a browser, the impact is limited.
CWEs
- CWE-565 · Reliance on Cookies without Validation and Integrity Checking
References
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gx76-c99x-2c96 ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-111749 ↗
- https://github.com/aio-libs/aiohttp/commit/6a07c171ef9f3be583e2907dcd1931372efca8d6 ↗
- https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4 ↗
- https://github.com/advisories/GHSA-gx76-c99x-2c96 ↗