nodemailer before 10.0.6 Denial of Service via addressparser

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-100700",
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "dateUpdated": "2026-09-26T13:23:56.526Z",
    "dateReserved": "2026-09-26T02:39:50.973Z",
    "datePublished": "2026-09-26T13:23:56.526Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck",
        "dateUpdated": "2026-09-26T13:23:56.526Z"
      },
      "datePublic": "2026-09-11T00:00:00.000Z",
      "title": "nodemailer before 10.0.6 Denial of Service via addressparser",
      "descriptions": [
        {
          "lang": "en",
          "value": "nodemailer before 10.0.6 contains a denial of service vulnerability in the addressparser free-text fallback regex pattern that exhibits quadratic backtracking behavior. Attackers can supply crafted email header values with long whitespace-free runs to block the Node.js event loop for tens of seconds, causing service unavailability."
        }
      ],
      "affected": [
        {
          "vendor": "nodemailer",
          "product": "nodemailer",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "10.0.6"
            },
            {
              "version": "10.0.6",
              "status": "unaffected",
              "versionType": "semver"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "Inefficient Algorithmic Complexity",
              "cweId": "CWE-407",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/nodemailer/nodemailer/security/advisories/GHSA-v53p-9fqp-m79j",
          "name": "GitHub Security Advisory (GHSA-v53p-9fqp-m79j)",
          "tags": [
            "vendor-advisory"
          ]
        },
        {
          "url": "https://www.vulncheck.com/advisories/nodemailer-before-10.0.6-denial-of-service-via-addressparser",
          "name": "VulnCheck Advisory: nodemailer before 10.0.6 Denial of Service via addressparser",
          "tags": [
            "third-party-advisory"
          ]
        }
      ],
      "metrics": [
        {
          "format": "CVSS"
        },
        {
          "format": "CVSS",
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "attackVector": "NETWORK",
            "attackComplexity": "LOW",
            "privilegesRequired": "NONE",
            "userInteraction": "NONE",
            "scope": "UNCHANGED",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH"
          }
        }
      ]
    }
  }
}