Nodemailer 3.0.0 before 10.0.10 Quadratic DKIM Header Unfolding Denial of Service
Nodemailer from 3.0.0 before 10.0.10 contains a denial of service vulnerability in MessageParser.parseHeaders that allows users to exhaust CPU through quadratic header unfolding. Attackers can supply large recipient lists or long headers that fold into tens of thousands of continuation lines, blocking the Node.js event loop during DKIM signing.
CVE-2026-110871
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-110871
nodemailer
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "nodemailer",
"product": "nodemailer",
"versions": [
{
"status": "affected",
"version": "3.0.0",
"lessThan": "10.0.10",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "10.0.10",
"versionType": "semver"
}
],
"packageURL": "pkg:npm/nodemailer",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-110871
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #42095 · Revision 1
- Added to Heist Feed
- Publisher date