CVE-2026-100700
Fixed in a distro release EPSS <1%CVSS 7.5
nodemailer before 10.0.6 contains a denial of service vulnerability in the addressparser free-text fallback regex pattern that exhibits quadratic backtracking behavior. Attackers can supply crafted email header values with long whitespace-free runs to block the Node.js event loop for tens of seconds, causing service unavailability.
Products: nodemailer
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| npm | nodemailer | 10.0.6 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | node-nodemailer | no fix |
| Debian 13 | node-nodemailer | no fix |
| Debian 14 | node-nodemailer | 10.0.10+~8.0.1-1 |
| Ubuntu 20.04 LTS | node-nodemailer | no fix |
| Ubuntu 22.04 LTS | node-nodemailer | no fix |
| Ubuntu 24.04 LTS | node-nodemailer | no fix |
| Ubuntu 26.04 LTS | node-nodemailer | no fix |
| Ubuntu 26.10 | node-nodemailer | no fix |