Security advisory

{
  "id": "7720f46a465bccc23cd05d2f65792aeb844083546cd8688436248b9c39ce6d0e",
  "url": "https://osv.dev/vulnerability/CVE-2016-10197",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2016-10197",
    "summary": "The search_make_new function in evdns.c in libevent before 2.1.6-beta allows attackers to cause a denial of service (out-of-bounds read) via an empty hostname.",
    "evidence": "osv:CVE-2016-10197",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2016-10197",
      "aliases": [
        "CVE-2016-10197"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/libevent/libevent",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "a73fb2f443ebf9687ee6ca81a6401d1f3751683f"
                },
                {
                  "fixed": "ec65c42052d95d2c23d1d837136d1cf1d9ecef9e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.1.6-beta"
                      }
                    ],
                    "source": "DESCRIPTION"
                  },
                  {
                    "range": [
                      {
                        "fixed": "ec65c42052d95d2c23d1d837136d1cf1d9ecef9e"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "release-2.1.5-beta",
            "release-2.1.4-alpha",
            "release-2.1.3-alpha",
            "release-2.1.2-alpha",
            "release-2.1.1-alpha",
            "release-2.0.10-stable",
            "release-2.0.9-rc",
            "release-2.0.8-rc",
            "release-2.0.7-rc",
            "release-2.0.6-rc",
            "release-2.0.5-beta",
            "release-2.0.4-alpha",
            "release-2.0.3-alpha",
            "release-2.0.1-alpha",
            "release-1.1b"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2016-10197.json",
            "vanir_signatures": [
              {
                "id": "CVE-2016-10197-b53ea4fd",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "214367120580076081898697868452724967811",
                    "164211120368855747282035090237193966170",
                    "292021247077176379054083257543566590152",
                    "112428809209276904449140038770404008020",
                    "215075892714760528797634730112271143100"
                  ]
                },
                "source": "https://github.com/libevent/libevent/commit/ec65c42052d95d2c23d1d837136d1cf1d9ecef9e",
                "target": {
                  "file": "evdns.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T13:13:20Z"
          }
        }
      ],
      "modified": "2026-10-20T13:13:20.321309625Z",
      "provider": "osv",
      "references": [
        "https://access.redhat.com/errata/RHSA-2017:1104",
        "https://access.redhat.com/errata/RHSA-2017:1106",
        "https://access.redhat.com/errata/RHSA-2017:1201",
        "https://github.com/libevent/libevent/blob/release-2.1.6-beta/ChangeLog",
        "https://security.gentoo.org/glsa/201705-01",
        "https://github.com/libevent/libevent/issues/332",
        "https://github.com/libevent/libevent/commit/ec65c42052d95d2c23d1d837136d1cf1d9ecef9e"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:libevent_project:libevent:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "libevent_project:libevent",
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "2.1.5"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "8.0"
                  },
                  {
                    "last_affected": "8.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2016-10197",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 387321,
  "published_at": "2017-03-15T15:59:00.5+00:00"
}