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CVE-2026-110871— Nodemailer 3.0.0 before 10.0.10 Quadratic DKIM Header Unfolding Denial of Service

Quick assessment

Affected
nodemailer nodemailer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nodemailer 从 3.0.0 到 10.0.10（不含）版本中存在一个拒绝服务漏洞，该漏洞位于 MessageParser.parseHeaders 函数中。攻击者可以通过提供包含大量收件人列表或非常长的、会被折叠成数万个续行的大头字段，利用二次展开的头字段耗尽 CPU 资源，从而阻塞 Node.js 的事件循环，影响 DKIM 签名过程。

CVSS 6.5 · Medium EPSS 0.25% · P16

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
nodemailer nodemailer 3.0.0< 10.0.10 affected
10.0.10 unaffected
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I. Basic Information for CVE-2026-110871

Vulnerability Information
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Vulnerability Title
Nodemailer 3.0.0 before 10.0.10 Quadratic DKIM Header Unfolding Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
nodemailer nodemailer 3.0.0 ~ 10.0.10 -

II. Public POCs for CVE-2026-110871

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III. Intelligence Information for CVE-2026-110871

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Other References for CVE-2026-110871 (2)

Same Patch Batch · nodemailer · 2026-10-14 · 4 CVEs total

CVE-2026-110869 7.5 HIGH Nodemailer 3.0.0 before 10.0.13 ReDoS via SMTP AUTH Mechanism Detection Regexes
CVE-2026-110872 5.9 MEDIUM Nodemailer 3.0.0 before 10.0.10 Denial of Service via SMTP Reply Parsing
CVE-2026-110870 5.3 MEDIUM Nodemailer before 10.0.13 Improper Input Validation via Angle-Bracket Address Comments

IV. Related Vulnerabilities

Same product: nodemailer
Same vendor: nodemailer
Same weakness: CWE-400

V. Comments for CVE-2026-110871

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