{"id":"CVE-2026-92598","title":"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","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 add…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","cwe":["CWE-436","CWE-289"],"vendor":"nodemailer","product":"nodemailer","affected":["nodemailer < 9.1.0"],"published":"2026-09-16","updated":"2026-09-17","sourceUpdated":"2026-09-17T15:16:58.903","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92598","references":[{"url":"https://github.com/nodemailer/nodemailer/commit/259c32d","label":"disclosure@vulncheck.com"},{"url":"https://github.com/nodemailer/nodemailer/commit/b212ac4","label":"disclosure@vulncheck.com"},{"url":"https://github.com/nodemailer/nodemailer/security/advisories/GHSA-wmmp-3585-3rmp","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/nodemailer-before-9.1.0-idn-punycode-domain-allow-list-bypass","label":"disclosure@vulncheck.com"},{"url":"https://github.com/nodemailer/nodemailer/security/advisories/GHSA-wmmp-3585-3rmp","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92598.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-92598"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-92598"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92598"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536089"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-17T14:40:05.615875Z"},"ingestedAt":"2026-09-16T22:06:50.927Z","epss":0.00264,"epssPercentile":0.18573,"slug":"CVE-2026-92598","body":"## Overview\n\nNodemailer 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Developer Hub, Self-service automation portal 2 · no fix planned: Red Hat Developer Hub, Self-service automation portal 2 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92598.json)","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":206163,"id":"CVE-2026-92598","ts":1789658481536,"field":"exploit_available","old":"false","new":"true"}]}