CVE-2026-110871CWE-400denial-of-service

CVE-2026-110871

Medium · published October 15, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
16.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
7.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00254 · 16.0th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2026-10-15T03:17Z
References (3)
https://github.com/nodemailer/nodemailer/security/advisories/GHSA-39m8-27wv-hr27 · [email protected]https://www.vulncheck.com/advisories/nodemailer-3.0.0-before-10.0.10-quadratic-dkim-header-unfolding-denial-of-service · [email protected]https://github.com/nodemailer/nodemailer/security/advisories/GHSA-39m8-27wv-hr27 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 16 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 14 OCT 22:52Z
    Nodemailer 3.0.0 before 10.0.10 Quadratic DKIM Header Unfolding Denial of Service
    cvelistv5
  • 14 OCT 22:52Z
    Nodemailer 3.0.0 before 10.0.10 Quadratic DKIM Header Unfolding Denial of Service
    cvelistv5