{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "6.9.16"
              },
              {
                "fixed": "9.1.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "e70b9c18bd4ba14d500197fa1614ed37f5536446"
            },
            {
              "fixed": "902b63e"
            }
          ],
          "repo": "https://github.com/nodemailer/nodemailer",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-cc9r-2j5m-2m83"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-436"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92597.json"
  },
  "details": "Nodemailer versions \u003e= 6.9.16 and \u003c 9.1.0 mis-parse RFC 5322 comments in email addresses: in lib/addressparser, a comment closed immediately before a non-break character causes the tokenizer to concatenate the atoms surrounding the comment instead of treating the comment as folding whitespace that terminates the domain. A recipient address such as user@good-corp.com(x)evil.com is therefore read by Nodemailer as the single domain good-corp.comevil.com (registrable domain comevil.com, which an attacker can register) and used for both the SMTP envelope (RCPT TO) and the emitted To:/From: headers, while a conformant RFC 5322 parser terminates the domain at the comment and reads good-corp.com. An application that validates the recipient domain with a strict RFC 5322 parser (without inspecting parse defects) or a naive prefix/substring allow-list and then hands the raw address to Nodemailer can be induced to deliver mail to a domain the attacker controls. Fixed in 9.1.0.",
  "id": "CVE-2026-92597",
  "modified": "2026-09-19T03:31:01.187431667Z",
  "published": "2026-09-16T21:47:01.599Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92597.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/nodemailer/nodemailer/security/advisories/GHSA-cc9r-2j5m-2m83"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-92597"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/nodemailer-before-9.1.0-email-domain-validation-bypass-via-rfc-5322-comment"
    },
    {
      "type": "FIX",
      "url": "https://github.com/nodemailer/nodemailer/commit/902b63e"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Nodemailer before 9.1.0 Email Domain Validation Bypass via RFC 5322 Comment"
}