Nodemailer: Quadratic (O(n^2)) SMTP client reply parsing lets a malicious server or MITM cause a pre-auth remote denial of service

影響: npm:nodemailer >= 3.0.0, <= 10.0.9 → 10.0.10

The SMTP client response parser reassembles multiline server replies by appending each continuation line onto a single response-queue entry and re-testing whether that entry is still a partial (continuation) reply on every line. The partial-response test runs str.slice(str.lastIndexOf('\n') + 1) on the growing entry, which forces a full flatten of the entire accumulated string on each line. A malicious or compromised SMTP server (or an on-path attacker on a plaintext or pre-STARTTLS hop) that s…

在 GitHub Advisory Database 阅读

2026/10/28 00:04，GitHub Advisory Database 发布了“Nodemailer: Quadratic (O(n^2)) SMTP client reply parsing lets a malicious server or MITM cause a pre-auth remote denial of service”（类型：漏洞公告）。严重程度为“中危”（medium）。相关技术：JavaScript / Node.js。