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CVE-2026-92598— Nodemailer before 9.1.0 IDN/Punycode Domain Allow-list Bypass

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.

在 9.1.0 之前，Nodemailer 在编码国际域名时未能应用 UTS-46 规范化，导致域名解析器计算出的 Punycode A-label 与符合标准的解析器结果不一致。攻击者可以构造包含不可见字符或兼容性映射的收件人地址，这些地址能够绕过域名白名单检查，并通过 SMTP 被投递到由攻击者控制的域名。

CVSS 6.5 · Medium EPSS 0.40% · P34

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
nodemailer nodemailer < 9.1.0 affected
9.1.0 unaffected
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I. Basic Information for CVE-2026-92598

Vulnerability Information
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Vulnerability Title
Nodemailer before 9.1.0 IDN/Punycode Domain Allow-list Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Nodemailer before 9.1.0 fails to apply UTS-46 normalization when encoding international domain names, causing the domain resolver to compute a different Punycode A-label than standards-compliant parsers. Attackers can craft recipient addresses with invisible characters or compatibility mappings that pass domain allow-list checks but are delivered to attacker-controlled domains via SMTP.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
解释冲突
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
nodemailer nodemailer 0 ~ 9.1.0 -

II. Public POCs for CVE-2026-92598

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III. Intelligence Information for CVE-2026-92598

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Patches & Fixes for CVE-2026-92598 (2)

Other References for CVE-2026-92598 (2)

Same Patch Batch · nodemailer · 2026-09-16 · 4 CVEs total

CVE-2026-92596 7.5 HIGH Nodemailer before 9.1.0 Denial of Service via addressparser
CVE-2026-92597 6.5 MEDIUM Nodemailer before 9.1.0 Email Domain Validation Bypass via RFC 5322 Comment
CVE-2026-92595 5.9 MEDIUM Nodemailer before 9.1.1 Security Sandbox Bypass via resolveContent

IV. Related Vulnerabilities

Same product: nodemailer
Same vendor: nodemailer
Same weakness: CWE-436