{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "16.0.0"
                  },
                  {
                    "last_affected": "17.1.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "introduced": "18.0.0"
                  },
                  {
                    "fixed": "18.3.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "03dc1d909818503b06240dadc81e9227ed2649cf"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "range": [
                  {
                    "fixed": "807858d7480f5075b0610817e3e44230890fb18e"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "v17.13.9",
                "range": [
                  {
                    "fixed": "5af45306226782035951fdc49f10fab5ebe021a2"
                  }
                ],
                "source": "REFERENCES_TAG"
              },
              {
                "original_tag": "v18.3.1",
                "range": [
                  {
                    "fixed": "4009bfb93639b7da53b7cb1de2e2d8617d36d5f5"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "b0356892c9342d340eab73f11d4086c0ceeebb9a"
            },
            {
              "last_affected": "b3833c45d68cf8efa09d74aadedd670d8958cd99"
            },
            {
              "introduced": "55b0096347c8bd963a9fc04060985344bb69f9ad"
            },
            {
              "fixed": "4009bfb93639b7da53b7cb1de2e2d8617d36d5f5"
            },
            {
              "fixed": "03dc1d909818503b06240dadc81e9227ed2649cf"
            },
            {
              "fixed": "807858d7480f5075b0610817e3e44230890fb18e"
            },
            {
              "fixed": "5af45306226782035951fdc49f10fab5ebe021a2"
            }
          ],
          "repo": "https://github.com/hapijs/joi",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-4528-x5fx-h6hg"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-1333"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118772.json"
  },
  "details": "joi is a schema description language and data validator for JavaScript. From 17.1.1 until 17.13.9 and 18.3.1, the Joi.string().email({ multiple: true }) rule uses a separator regular expression whose leading whitespace quantifier is retried at every position in a long whitespace run that contains no separator, causing quadratic work during String.prototype.split. The behavior applies to the default separator and every custom separator. Applications that validate attacker-controlled values with the multiple option and no effective prior length limit can have the Node.js event loop blocked for seconds by one request, preventing other work. A .max() rule is not sufficient when abortEarly: false allows the email rule to run after the maximum-length check fails. This vulnerability is fixed in versions 17.13.9 and 18.3.1.",
  "id": "CVE-2026-118772",
  "modified": "2026-11-05T02:31:01.388310353Z",
  "published": "2026-10-29T18:13:33.771Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/hapijs/joi/releases/tag/v17.13.9"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hapijs/joi/releases/tag/v18.3.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118772.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/hapijs/joi/security/advisories/GHSA-4528-x5fx-h6hg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118772"
    },
    {
      "type": "FIX",
      "url": "https://github.com/hapijs/joi/commit/03dc1d909818503b06240dadc81e9227ed2649cf"
    },
    {
      "type": "FIX",
      "url": "https://github.com/hapijs/joi/commit/807858d7480f5075b0610817e3e44230890fb18e"
    },
    {
      "type": "FIX",
      "url": "https://github.com/hapijs/joi/pull/3162"
    },
    {
      "type": "FIX",
      "url": "https://github.com/hapijs/joi/pull/3163"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "joi: quadratic-time split in `string().email({ multiple: true })` allows denial of service"
}