High
Nodemailer before 9.1.0 IDN/Punycode Domain Allow-list Bypass
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-92598
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 18:03 UTC · Revision 1
Source evidence
Nodemailer before 9.1.0 IDN/Punycode Domain Allow-list Bypass
core-osv · Original sourcePublished 16 Sept 2026, 21:47 UTC
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.
osv:CVE-2026-92598
Complete source record
{
"id": "f466c55ff231ab3bd875fbf08579f15d9d3d46b71161b44c5f68bb6eb3f258cc",
"url": "https://osv.dev/vulnerability/CVE-2026-92598",
"method": "structured",
"payload": {
"kind": "advisory",
"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.",
"evidence": "osv:CVE-2026-92598",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-92598",
"aliases": [
"CVE-2026-92598",
"GHSA-wmmp-3585-3rmp"
],
"metrics": [
{
"type": "CVSS_V4",
"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"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/nodemailer/nodemailer",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "efd6e29c10c6e0c25c57bd2f2a71302838235a4f"
},
{
"fixed": "259c32d"
},
{
"fixed": "b212ac4"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "9.1.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
"fixed": "259c32d"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "b212ac4"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"v9.0.6",
"v9.0.5",
"v9.0.4",
"v9.0.3",
"v9.0.2",
"v9.0.1",
"v9.0.0",
"v8.0.11",
"v8.0.10",
"v8.0.9",
"v8.0.8",
"v8.0.7",
"v8.0.6",
"v8.0.5",
"v8.0.4",
"v8.0.3",
"v8.0.2",
"v8.0.1",
"v8.0.0",
"v7.0.13",
"v7.0.12",
"v7.0.11",
"v7.0.10",
"v7.0.9",
"v7.0.7",
"v7.0.6",
"v7.0.5",
"v6.9.16",
"v6.9.15",
"v6.9.14",
"v6.9.13",
"v6.9.10",
"v6.9.8",
"v6.9.7",
"v6.9.6",
"v6.9.5",
"v6.9.4",
"v6.9.3",
"v6.9.2",
"v6.9.1",
"v6.9.0",
"v6.8.0",
"v6.7.8",
"v6.7.7",
"v6.7.6",
"v6.7.5",
"v6.7.4",
"v6.7.3",
"v6.7.2",
"v6.7.1",
"v6.7.0",
"v6.6.5",
"v6.6.4",
"v6.6.3",
"v6.6.1",
"v6.6.0",
"v6.5.0",
"v6.4.18",
"v6.4.17",
"v6.4.16",
"v6.4.15",
"v6.4.14",
"v6.4.13",
"v6.4.12",
"v6.4.11",
"v6.4.10",
"v6.4.8",
"v6.4.7",
"v6.4.6",
"v6.4.5",
"v6.4.4",
"v6.4.3",
"v6.4.2",
"v6.4.1",
"v6.4.0",
"v6.3.1",
"v6.3.0",
"v6.2.1",
"v6.2.0",
"v6.1.1",
"v6.1.0",
"v6.0.0",
"v5.1.1",
"v5.1.0",
"v5.0.1",
"v5.0.0",
"v4.7.0",
"v4.6.8",
"v4.6.7",
"v4.6.6",
"v4.6.5",
"v4.6.4",
"v4.6.3",
"v4.6.2",
"v4.6.1",
"v4.6.0",
"v4.5.0",
"v4.4.2",
"v4.4.1",
"v4.4.0",
"v4.3.1",
"v4.3.0",
"v4.2.0",
"v4.1.3",
"v4.1.2",
"v4.1.1",
"v4.1.0",
"v4.0.1",
"v4.0.0",
"v3.1.8",
"v3.1.7",
"v3.1.6",
"v3.1.5",
"v3.1.4",
"v3.1.3",
"v3.1.2",
"v3.1.1",
"v3.1.0",
"v3.0.2",
"v3.0.1",
"v3.0.0",
"v2.7.2",
"v2.7.1",
"v2.7.0",
"v2.6.4",
"v2.6.3",
"v2.6.2",
"v2.6.1",
"v2.6.0",
"v2.5.0",
"v2.4.2",
"v2.4.1",
"v2.4.0",
"v2.3.2",
"v2.3.2-gpgtest.0",
"v2.3.1",
"v2.3.0",
"v2.2.1",
"v2.2.0",
"v2.1.0",
"v2.0.0",
"v1.11.0",
"v1.10.0",
"v1.9.0",
"v1.8.0",
"v1.7.0",
"v1.6.0",
"v1.5.0",
"v1.4.0",
"v1.3.4",
"v1.3.3",
"v1.3.2",
"v1.3.1",
"v1.3.0",
"v1.2.2",
"v1.2.1",
"v1.2.0",
"v1.1.2",
"v1.1.1",
"v1.1.0",
"v1.0.4",
"v1.0.3",
"v1.0.2",
"v1.0.1",
"v1.0.0",
"v0.7.1",
"v0.7.0",
"v0.6.5",
"v0.6.4",
"v0.6.3",
"v0.6.2",
"v0.6.1",
"v0.6.0",
"v0.5.15",
"v0.5.14",
"v0.5.13",
"v0.5.12",
"v0.5.11",
"v0.5.9",
"v0.5.8",
"v0.5.7",
"v0.5.6",
"v0.5.5",
"v0.5.4",
"v0.5.3",
"v0.5.2",
"v0.5.1",
"v0.5.0",
"v0.4.4",
"v0.4.3",
"v0.4.2",
"v0.4.1",
"v0.4.0",
"v0.3.45",
"v0.3.44",
"v0.3.43",
"v0.3.42",
"v0.3.41",
"v0.3.40",
"v0.3.39",
"v0.3.38",
"v0.3.37",
"v0.3.35",
"v0.3.34",
"v0.3.33",
"v0.3.32",
"v0.3.31",
"v0.3.30",
"v0.3.29",
"v0.3.28",
"v0.3.27",
"v0.3.26",
"v0.3.25",
"v0.3.22",
"v0.3.21",
"v0.3.20",
"v0.3.19",
"v0.3.18",
"v0.3.17",
"v0.3.16",
"v0.3.15",
"v0.3.14",
"v0.3.13",
"v0.3.12",
"v0.3.11",
"v0.3.10",
"v0.3.9",
"v0.3.8",
"v0.3.7",
"v0.3.6",
"v0.3.5",
"v0.3.4",
"v0.3.3",
"v0.3.2",
"v0.3.1",
"v0.3.0",
"v0.2.4",
"v0.2.3",
"v0.2.2",
"v0.2.0",
"v0.1.24",
"v0.1.23",
"v0.1.22",
"v0.1.21",
"v0.1.20",
"v0.1.19",
"v0.1.17",
"v0.1.16",
"v0.1.15",
"v0.1.14",
"v0.1.13",
"v0.1.12",
"v0.1.10",
"v0.1.9",
"v0.1.8",
"v0.1.7",
"v0.1.6",
"v0.1.5",
"v0.1.4",
"v0.1.3",
"v0.1.2",
"v0.1.1",
"v0.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-92598.json"
}
}
],
"modified": "2026-10-28T02:30:31.305070838Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92598.json",
"https://github.com/nodemailer/nodemailer/security/advisories/GHSA-wmmp-3585-3rmp",
"https://nvd.nist.gov/vuln/detail/CVE-2026-92598",
"https://www.vulncheck.com/advisories/nodemailer-before-9.1.0-idn-punycode-domain-allow-list-bypass",
"https://github.com/nodemailer/nodemailer/commit/259c32d",
"https://github.com/nodemailer/nodemailer/commit/b212ac4"
],
"provider_metadata": {
"cwe_ids": [
"CWE-436"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92598.json"
}
},
"related_cves": [
{
"value": "CVE-2026-92598",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 498137,
"published_at": "2026-09-16T21:47:02.365+00:00"
}