GHSA-GX76-C99X-2C96

Vulnerability from github – Published: 2026-10-20 19:58 – Updated: 2026-10-20 19:58
VLAI
Summary
AIOHTTP: Cookie from subdomain can remove Host-Only Scope from existing cookies
Details

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.

Severity
2.3 (Low)
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
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 3.14.3"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "aiohttp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.14.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-111749"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-565"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-20T19:58:14Z",
    "nvd_published_at": "2026-10-19T17:17:04Z",
    "severity": "LOW"
  },
  "details": "### Summary\n\nA subdomain can remove the Host-Only flag from an existing cookie to a parent domain.\n\n### Impact\n\nA user accessing untrusted subdomains could see their Host-Only protections stripped from cookies. Given most usecases won\u0027t reflect these cookies to a browser, the impact is limited.",
  "id": "GHSA-gx76-c99x-2c96",
  "modified": "2026-10-20T19:58:14Z",
  "published": "2026-10-20T19:58:14Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gx76-c99x-2c96"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111749"
    },
    {
      "type": "WEB",
      "url": "https://github.com/aio-libs/aiohttp/commit/6a07c171ef9f3be583e2907dcd1931372efca8d6"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/aio-libs/aiohttp"
    },
    {
      "type": "WEB",
      "url": "https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "AIOHTTP: Cookie from subdomain can remove Host-Only Scope from existing cookies"
}



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