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CVE-2026-92597— Nodemailer before 9.1.0 Email Domain Validation Bypass via RFC 5322 Comment

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 版本从 6.9.16 到 9.1.0 存在一个缺陷：在解析 RFC 5322 电子邮件地址中的注释时出现错误。具体而言，在 模块中，如果一个注释紧邻在非空白字符之前结束，令牌生成器（tokenizer）会将注释周围的原子直接拼接在一起，而没有将注释视为可折叠的空白字符，从而未能正确终止域名。 因此，一个像 这样的收件人地址，会被 Nodemailer 解析为单一域名 （其可注册域名为 ，攻击者可以注册该域名）。这个被错误解析的域名同时被用于 SMTP 信封（RCPT TO）以及生成的 / 头部

CVSS 6.5 · Medium
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I. Basic Information for CVE-2026-92597

Vulnerability Information
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Vulnerability Title
Nodemailer before 9.1.0 Email Domain Validation Bypass via RFC 5322 Comment
Source: CVE Program / CVE List V5
Vulnerability Description
Nodemailer versions >= 6.9.16 and < 9.1.0 mis-parse RFC 5322 comments in email addresses: in lib/addressparser, a comment closed immediately before a non-break character causes the tokenizer to concatenate the atoms surrounding the comment instead of treating the comment as folding whitespace that terminates the domain. A recipient address such as user@good-corp.com(x)evil.com is therefore read by Nodemailer as the single domain good-corp.comevil.com (registrable domain comevil.com, which an attacker can register) and used for both the SMTP envelope (RCPT TO) and the emitted To:/From: headers, while a conformant RFC 5322 parser terminates the domain at the comment and reads good-corp.com. An application that validates the recipient domain with a strict RFC 5322 parser (without inspecting parse defects) or a naive prefix/substring allow-list and then hands the raw address to Nodemailer can be induced to deliver mail to a domain the attacker controls. Fixed in 9.1.0.
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 6.9.16 ~ 9.1.0 -

II. Public POCs for CVE-2026-92597

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III. Intelligence Information for CVE-2026-92597

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Patches & Fixes for CVE-2026-92597 (1)

Other References for CVE-2026-92597 (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-2026-92598 6.5 MEDIUM Nodemailer before 9.1.0 IDN/Punycode Domain Allow-list Bypass
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

V. Comments for CVE-2026-92597

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