GHSA-PQXQ-W44R-73XW

Vulnerability from github – Published: 2026-10-20 19:52 – Updated: 2026-10-20 19:52
VLAI
Summary
AIOHTTP: Pure-Python parser request smuggling
Details

Summary

The pure Python parser is vulnerable to an HTTP request smuggling attack.

Impact

If users are using the Python parser (AIOHTTP_NO_EXTENSIONS, or not a standard wheel installed), then an application may be vulnerable to a request smuggling attack.

Workaround

Switch to the default C parser.

Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L
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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-2026-111750"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-444"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-20T19:52:21Z",
    "nvd_published_at": "2026-10-19T17:17:04Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nThe pure Python parser is vulnerable to an HTTP request smuggling attack.\n\n### Impact\n\nIf users are using the Python parser (`AIOHTTP_NO_EXTENSIONS`, or not a standard wheel installed), then an application may be vulnerable to a request smuggling attack.\n\n### Workaround\n\nSwitch to the default C parser.",
  "id": "GHSA-pqxq-w44r-73xw",
  "modified": "2026-10-20T19:52:22Z",
  "published": "2026-10-20T19:52:21Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-pqxq-w44r-73xw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111750"
    },
    {
      "type": "WEB",
      "url": "https://github.com/aio-libs/aiohttp/commit/9b27347e61454d9f8ca2055f4c67a37dee336e83"
    },
    {
      "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:N/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L",
      "type": "CVSS_V4"
    }
  ],
  "summary": "AIOHTTP: Pure-Python parser request smuggling"
}



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