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CVE-2026-92598 (GCVE-0-2026-92598)

Vulnerability from cvelistv5 – Published: 2026-09-16 21:47 – Updated: 2026-09-16 21:47
VLAI
Title
Nodemailer before 9.1.0 IDN/Punycode Domain Allow-list Bypass
Summary
Nodemailer before 9.1.0 fails to apply UTS-46 normalization when encoding international domain names, causing the domain resolver to compute a different Punycode A-label than standards-compliant parsers. Attackers can craft recipient addresses with invisible characters or compatibility mappings that pass domain allow-list checks but are delivered to attacker-controlled domains via SMTP.
Severity
8.3 (High)
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
6.5 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
CWE
  • CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
Vendor Product Version CPE status
nodemailer nodemailer Affected: 0 , < 9.1.0 (semver)
Unaffected: 9.1.0 (semver)
    cpe:2.3:a:nodemailer:nodemailer:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-09-01 00:00
Credits
e1abrador
Show details on NVD website
To clipboard 

{
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        {
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          "packageURL": "pkg:npm/nodemailer",
          "product": "nodemailer",
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              "version": "0",
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            },
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              "version": "9.1.0",
              "versionType": "semver"
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      "descriptions": [
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          "value": "Nodemailer before 9.1.0 fails to apply UTS-46 normalization when encoding international domain names, causing the domain resolver to compute a different Punycode A-label than standards-compliant parsers. Attackers can craft recipient addresses with invisible characters or compatibility mappings that pass domain allow-list checks but are delivered to attacker-controlled domains via SMTP."
        }
      ],
      "metrics": [
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            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
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            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
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            "version": "4.0",
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            "userInteraction": "NONE",
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            "version": "3.1"
          },
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      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-436",
              "description": "Interpretation Conflict",
              "lang": "en",
              "type": "CWE"
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      "providerMetadata": {
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        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
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      "references": [
        {
          "name": "GitHub Security Advisory (GHSA-wmmp-3585-3rmp)",
          "tags": [
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          "url": "https://github.com/nodemailer/nodemailer/security/advisories/GHSA-wmmp-3585-3rmp"
        },
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          "tags": [
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          "url": "https://github.com/nodemailer/nodemailer/commit/259c32d"
        },
        {
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          "tags": [
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          ],
          "url": "https://github.com/nodemailer/nodemailer/commit/b212ac4"
        },
        {
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          "tags": [
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          "url": "https://www.vulncheck.com/advisories/nodemailer-before-9.1.0-idn-punycode-domain-allow-list-bypass"
        }
      ],
      "title": "Nodemailer before 9.1.0 IDN/Punycode Domain Allow-list Bypass",
      "x_generator": {
        "engine": "vulncheck-endgame"
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  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-92598",
    "datePublished": "2026-09-16T21:47:02.365Z",
    "dateReserved": "2026-09-16T13:48:49.970Z",
    "dateUpdated": "2026-09-16T21:47:02.365Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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