Security advisory

{
  "id": "80c5c0995ca86482c5e920d050edf5d7a7039d485a60b7cc2b1f8ff4823a363f",
  "url": "https://osv.dev/vulnerability/CVE-2018-1000164",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-1000164",
    "summary": "gunicorn version 19.4.5 contains a CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers vulnerability in \"process_headers\" function in \"gunicorn/http/wsgi.py\" that can result in an attacker causing the server to return arbitrary HTTP headers. This vulnerability appears to have been fixed in 19.5.0.",
    "evidence": "osv:CVE-2018-1000164",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2018-1000164",
      "aliases": [
        "CVE-2018-1000164",
        "GHSA-32pc-xphx-q4f6",
        "PYSEC-2018-55"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/benoitc/gunicorn",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6dcd7a6ada1b6f9bd9d2840b12b4a6cee0e96301"
                },
                {
                  "last_affected": "6dcd7a6ada1b6f9bd9d2840b12b4a6cee0e96301"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:gunicorn:gunicorn:19.4.5:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "19.4.5"
                      },
                      {
                        "last_affected": "19.4.5"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "19.4.5"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-1000164.json"
          }
        }
      ],
      "modified": "2026-10-20T10:49:48.437423647Z",
      "provider": "osv",
      "references": [
        "https://usn.ubuntu.com/4022-1/",
        "https://lists.debian.org/debian-lts-announce/2018/04/msg00022.html",
        "https://www.debian.org/security/2018/dsa-4186",
        "https://github.com/benoitc/gunicorn/issues/1227",
        "https://epadillas.github.io/2018/04/02/http-header-splitting-in-gunicorn-19.4.5"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*",
              "cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "7.0"
                  },
                  {
                    "last_affected": "7.0"
                  },
                  {
                    "introduced": "8.0"
                  },
                  {
                    "last_affected": "8.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2018-1000164",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 380823,
  "published_at": "2018-04-18T19:29:00.707+00:00"
}