Security advisory

{
  "id": "9bd8a68d81519158f623665a8deef7e281f28e5de34d09f2eecbdc909f82fbd1",
  "url": "https://osv.dev/vulnerability/CVE-2020-26137",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-26137",
    "summary": "urllib3 before 1.25.9 allows CRLF injection if the attacker controls the HTTP request method, as demonstrated by inserting CR and LF control characters in the first argument of putrequest(). NOTE: this is similar to CVE-2020-26116.",
    "evidence": "osv:CVE-2020-26137",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-26137",
      "aliases": [
        "CVE-2020-26137",
        "GHSA-wqvq-5m8c-6g24",
        "PYSEC-2020-148"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/urllib3/urllib3",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "21758b0694ea53b499e832a993e8d1ada01135b2"
                },
                {
                  "fixed": "1dd69c5c5982fae7c87a620d487c2ebf7a6b436b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.25.9"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "1dd69c5c5982fae7c87a620d487c2ebf7a6b436b"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.25.8",
            "1.25.7",
            "1.25.6",
            "1.25.5",
            "1.25.4",
            "1.25.3",
            "1.25.2",
            "1.25.1",
            "1.25",
            "1.7.1",
            "1.7",
            "1.6",
            "1.5",
            "1.4",
            "1.3",
            "1.2.1",
            "1.2",
            "1.1",
            "0.4.1",
            "0.4",
            "0.3.1",
            "0.3"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-26137.json"
          }
        }
      ],
      "modified": "2026-10-20T10:52:55.351407399Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2023/10/msg00012.html",
        "https://lists.debian.org/debian-lts-announce/2021/06/msg00015.html",
        "https://usn.ubuntu.com/4570-1/",
        "https://bugs.python.org/issue39603",
        "https://github.com/urllib3/urllib3/commit/1dd69c5c5982fae7c87a620d487c2ebf7a6b436b",
        "https://github.com/urllib3/urllib3/pull/1800",
        "https://www.oracle.com/security-alerts/cpujul2022.html",
        "https://www.oracle.com/security-alerts/cpuoct2021.html"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*",
              "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
              "cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*"
            ],
            "vendor_product": "canonical:ubuntu_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "16.04"
                  },
                  {
                    "last_affected": "16.04"
                  },
                  {
                    "introduced": "18.04"
                  },
                  {
                    "last_affected": "18.04"
                  },
                  {
                    "introduced": "20.04"
                  },
                  {
                    "last_affected": "20.04"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "9.0"
                  },
                  {
                    "last_affected": "9.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:22.2.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "oracle:communications_cloud_native_core_network_function_cloud_native_environment",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "22.2.0"
                  },
                  {
                    "last_affected": "22.2.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*"
            ],
            "vendor_product": "oracle:zfs_storage_appliance_kit",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "8.8"
                  },
                  {
                    "last_affected": "8.8"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-26137",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384038,
  "published_at": "2020-09-30T18:15:26.773+00:00"
}