CVE-2026-92596

high

Description

Nodemailer before 9.1.0 contains a quadratic time complexity vulnerability in the addressparser component that allows remote attackers to cause denial of service by supplying a crafted comma-separated address list. Attackers can send a single email with a large number of addresses to block the Node.js event loop for extended periods, consuming 100% CPU and freezing the process.

References

https://www.vulncheck.com/advisories/nodemailer-before-9.1.0-denial-of-service-via-addressparser

https://github.com/nodemailer/nodemailer/security/advisories/GHSA-2x7j-588g-ccc2

https://github.com/nodemailer/nodemailer/commit/9116da9

https://github.com/nodemailer/nodemailer/commit/83b8c48

https://github.com/nodemailer/nodemailer/commit/7cc38af

https://github.com/nodemailer/nodemailer/commit/34da642

Details

Source: Mitre, NVD

Published: 2026-09-16

Updated: 2026-09-17

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Severity: High

CVSS v3

Base Score: 7.5

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Severity: High

CVSS v4

Base Score: 8.7

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Severity: High

EPSS

EPSS: 0.00453