AIOHTTP: Pure-Python parser request smuggling

{
  "id": "2f39c683ad504e19ea8515fea77abb39f8d5d3ff7b0e22bca43260955e80c8d1",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-111750",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "AIOHTTP: Pure-Python parser request smuggling",
    "summary": "AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, the pure Python parser accepts ambiguous HTTP request framing. An unauthenticated attacker can consequently smuggle requests when an application uses AIOHTTP_NO_EXTENSIONS or otherwise runs without a standard wheel and an intermediary interprets the framing differently. This issue is fixed in version 3.14.4.",
    "evidence": "cve:CVE-2026-111750",
    "products": [
      {
        "name": {
          "value": "aiohttp",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-111750",
      "aliases": [
        "CVE-2026-111750"
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "version": "4.0",
            "baseScore": 6.3,
            "attackVector": "NETWORK",
            "baseSeverity": "MEDIUM",
            "vectorString": "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",
            "userInteraction": "NONE",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "privilegesRequired": "NONE",
            "subIntegrityImpact": "LOW",
            "vulnIntegrityImpact": "LOW",
            "subAvailabilityImpact": "LOW",
            "vulnAvailabilityImpact": "LOW",
            "subConfidentialityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE"
          }
        }
      ],
      "affected": [
        {
          "vendor": "aio-libs",
          "product": "aiohttp",
          "versions": [
            {
              "status": "affected",
              "version": "< 3.14.4"
            }
          ]
        }
      ],
      "modified": "2026-10-28T15:27:37.704Z",
      "provider": "cve",
      "references": [
        "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-pqxq-w44r-73xw",
        "https://github.com/aio-libs/aiohttp/commit/9b27347e61454d9f8ca2055f4c67a37dee336e83",
        "https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4"
      ],
      "provider_metadata": {
        "adp": [
          {
            "title": "CISA ADP Vulnrichment",
            "metrics": [
              {
                "other": {
                  "type": "ssvc",
                  "content": {
                    "id": "CVE-2026-111750",
                    "role": "CISA Coordinator",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "version": "2.0.3",
                    "timestamp": "2026-10-28T15:27:28.793398Z"
                  }
                }
              }
            ],
            "providerMetadata": {
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP",
              "dateUpdated": "2026-10-28T15:27:37.704Z"
            }
          }
        ],
        "cna": {
          "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
          "shortName": "GitHub_M",
          "dateUpdated": "2026-10-19T17:06:37.997Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-111750",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 456109,
  "published_at": "2026-10-19T17:06:37.997+00:00"
}