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CVE-2026-110872— Nodemailer 3.0.0 before 10.0.10 Denial of Service via SMTP Reply Parsing

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 在 3.0.0 到 10.0.10 版本之间存在一个二次复杂度的拒绝服务漏洞，该漏洞出现在 SMTPConnection._onData 和 isPartialResponse 方法中的 SMTP 客户端回复解析器中。恶意 SMTP 服务器或中间人攻击者可以在认证之前持续发送续行数据而不发送完成行，从而导致 Node.js 事件循环阻塞并耗尽内存。

CVSS 5.9 · Medium EPSS 0.29% · P20

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-2026-110872

Vulnerability Information
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Vulnerability Title
Nodemailer 3.0.0 before 10.0.10 Denial of Service via SMTP Reply Parsing
Source: CVE Program / CVE List V5
Vulnerability Description
Nodemailer from 3.0.0 before 10.0.10 contains a quadratic complexity denial of service vulnerability in the SMTP client reply parser in SMTPConnection._onData and isPartialResponse. A malicious SMTP server or on-path attacker can stream continuation lines without a completion line before authentication, blocking the Node.js event loop and exhausting memory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/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-2026-110872

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III. Intelligence Information for CVE-2026-110872

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Other References for CVE-2026-110872 (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-2026-110871 6.5 MEDIUM Nodemailer 3.0.0 before 10.0.10 Quadratic DKIM Header Unfolding Denial of Service
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-2026-110872

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