High
node-nodemailer — security advisory
Nodemailer versions 9.1.0 through 10.0.4 contain a quadratic time complexity vulnerability in the addressparser component when parsing email addresses with RFC 5322 comments. Attackers can craft malicious email headers with comment-separated atoms to consume excessive CPU and block the Node.js event loop for several seconds, causing denial of service.
- Products
- node-nodemailer
- Affected versions
- 6.3.0-2, 6.3.1-1, 6.4.0-1, 6.4.1-1, 6.4.17-3, 6.4.2-1, 6.4.5-1, 6.7.0-1, 6.7.0-2, 6.7.1+~6.4.4-1, 6.9.4+~6.4.9-2, 6.9.4+~6.4.9-3ubuntu1, 6.9.4+~6.4.9-4, 7.0.10+~7.0.2-1, 7.0.12+~7.0.5-1, 7.0.5+~7.0.1-1, 7.0.9+~7.0.2-2, 8.0.4+~7.0.11-1, 8.0.4+~7.0.11-2, 9.0.0+~8.0.1-1, 9.0.3+~8.0.1-1, 9.0.5+~8.0.1-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-90776
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:31 UTC · Revision 1
Source evidence
Nodemailer versions 9.1.0 through 10.0.4 contain a quadratic time complexity vulnerability in the addressparser component when parsing email addresses with RFC 5322 comments. Attackers can craft malicious email headers with comment-separated atoms to consume excessive CPU and block the Node.js event loop for several seconds, causing denial of service.
osv:UBUNTU-CVE-2026-90776
node-nodemailer
Fixed versions: Not specified
node-nodemailer
Fixed versions: Not specified
node-nodemailer
Fixed versions: Not specified
node-nodemailer
Fixed versions: Not specified
node-nodemailer
Fixed versions: Not specified
Complete source record
{
"id": "49cc76e0c1875b956852c98261f5f2cee30198eedc7ff5cb66e1cde148de2b0f",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-90776",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-90776",
"summary": "Nodemailer versions 9.1.0 through 10.0.4 contain a quadratic time complexity vulnerability in the addressparser component when parsing email addresses with RFC 5322 comments. Attackers can craft malicious email headers with comment-separated atoms to consume excessive CPU and block the Node.js event loop for several seconds, causing denial of service.",
"evidence": "osv:UBUNTU-CVE-2026-90776",
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"evidence": "/affected/0/package/name"
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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{
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{
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"evidence": "/affected/3/versions"
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{
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"affected_versions": [
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{
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"evidence": "/affected/4/versions"
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{
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"evidence": "/affected/4/versions"
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{
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"evidence": "/affected/4/versions"
},
{
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"evidence": "/affected/4/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-90776",
"aliases": [
"UBUNTU-CVE-2026-90776"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"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"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
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"events": [
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"6.4.0-1",
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"database_specific": {
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},
"ecosystem_specific": {
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{
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"purl": "pkg:deb/ubuntu/node-nodemailer?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
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],
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},
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},
"versions": [
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],
"modified": "2026-10-17T13:01:16.722402700Z",
"provider": "osv",
"upstream": [
"CVE-2026-90776"
],
"references": [
"https://ubuntu.com/security/CVE-2026-90776",
"https://www.cve.org/CVERecord?id=CVE-2026-90776",
"https://github.com/nodemailer/nodemailer/security/advisories/GHSA-prgh-xp8r-p3m5"
]
},
"related_cves": [
{
"value": "CVE-2026-90776",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 361477,
"published_at": "2026-09-13T12:17:00+00:00"
}