High
Nodemailer before 9.1.0 Denial of Service via addressparser
Type: advisorySources: OSV
Nodemailer before 9.1.0 contains a quadratic time complexity vulnerability in the addressparser component that allows remote attackers to cause denial of service by supplying a crafted comma-separated address list. Attackers can send a single email with a large number of addresses to block the Node.js event loop for extended periods, consuming 100% CPU and freezing the process.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-92596
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 13:06 UTC · Revision 1
Source evidence
Nodemailer before 9.1.0 Denial of Service via addressparser
core-osv · Original sourcePublished 16 Sept 2026, 21:47 UTC
Nodemailer before 9.1.0 contains a quadratic time complexity vulnerability in the addressparser component that allows remote attackers to cause denial of service by supplying a crafted comma-separated address list. Attackers can send a single email with a large number of addresses to block the Node.js event loop for extended periods, consuming 100% CPU and freezing the process.
osv:CVE-2026-92596
Complete source record
{
"id": "643c5383c738d911daa79bbeab54de1b05d9c962d15d1b64cf11da049cfde4a7",
"url": "https://osv.dev/vulnerability/CVE-2026-92596",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Nodemailer before 9.1.0 Denial of Service via addressparser",
"summary": "Nodemailer before 9.1.0 contains a quadratic time complexity vulnerability in the addressparser component that allows remote attackers to cause denial of service by supplying a crafted comma-separated address list. Attackers can send a single email with a large number of addresses to block the Node.js event loop for extended periods, consuming 100% CPU and freezing the process.",
"evidence": "osv:CVE-2026-92596",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-92596",
"aliases": [
"CVE-2026-92596",
"GHSA-2x7j-588g-ccc2"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
}
],
"affected": [
{
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"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
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"source": "REFERENCES_COMMIT"
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],
"modified": "2026-10-28T02:30:50.788284630Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92596.json",
"https://github.com/nodemailer/nodemailer/security/advisories/GHSA-2x7j-588g-ccc2",
"https://nvd.nist.gov/vuln/detail/CVE-2026-92596",
"https://www.vulncheck.com/advisories/nodemailer-before-9.1.0-denial-of-service-via-addressparser",
"https://github.com/nodemailer/nodemailer/commit/34da642",
"https://github.com/nodemailer/nodemailer/commit/7cc38af",
"https://github.com/nodemailer/nodemailer/commit/83b8c48",
"https://github.com/nodemailer/nodemailer/commit/9116da9"
],
"provider_metadata": {
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"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92596.json"
}
},
"related_cves": [
{
"value": "CVE-2026-92596",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 519384,
"published_at": "2026-09-16T21:47:00.9+00:00"
}