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CVE-2026-100702— Nodemailer before 10.0.2 Stack Exhaustion via Nested Recipient Arrays

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 10.0.2 之前的版本无法正确扁平化收件人字段（如 to、cc 和 bcc）中的深层嵌套数组，从而允许攻击者导致堆栈耗尽。攻击者可以提供深层嵌套的 JSON 收件人数组，触发递归的 Array.toString() 转换，耗尽调用栈并导致 Node.js 进程终止。

CVSS 5.9 · Medium EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-100702

Vulnerability Information
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Vulnerability Title
Nodemailer before 10.0.2 Stack Exhaustion via Nested Recipient Arrays
Source: CVE Program / CVE List V5
Vulnerability Description
Nodemailer before 10.0.2 fails to properly flatten deeply nested arrays in recipient fields such as to, cc, and bcc, allowing attackers to cause stack exhaustion. Attackers can supply a deeply nested JSON recipient array that triggers recursive Array.toString() conversion, exhausting the call stack and terminating the Node.js process.
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
未经控制的递归
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
nodemailer nodemailer 0 ~ 10.0.2 -

II. Public POCs for CVE-2026-100702

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III. Intelligence Information for CVE-2026-100702

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Vendor Advisories for CVE-2026-100702 (2)

Same Patch Batch · nodemailer · 2026-09-26 · 4 CVEs total

CVE-2026-100700 7.5 HIGH nodemailer before 10.0.6 Denial of Service via addressparser
CVE-2026-100701 5.9 MEDIUM Nodemailer 5.0.0 through 10.0.1 TLS servername Cache Confusion
CVE-2026-100699 5.3 MEDIUM Nodemailer before 10.0.9 Malformed Envelope Recipient via RFC 5322 Comment

IV. Related Vulnerabilities

Same product: nodemailer
Same vendor: nodemailer
Same weakness: CWE-674

V. Comments for CVE-2026-100702

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