AIOHTTP: Cookie from subdomain can remove Host-Only Scope from existing cookies

GHSA-gx76-c99x-2c96 · CVE-2026-111749

Published Oct 20, 2026 · Modified Oct 20, 2026

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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.

References

WEB https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gx76-c99x-2c96
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-111749
WEB https://github.com/aio-libs/aiohttp/commit/6a07c171ef9f3be583e2907dcd1931372efca8d6
PACKAGE https://github.com/aio-libs/aiohttp
WEB https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4

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