---
cve: "CVE-2026-90776"
severity: "HIGH"
cvss: 8.7
epss: "48%"
vendor: "nodemailer"
kev: false
exploited: false
published: "2026-09-13 12:17:16"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-19T14:33:30+02:00"
---

# CVE-2026-90776

> 8.7 HIGH · 🧪 PoC

## Beschreibung

Nodemailer versions 9.1.0 through 10.0.4 contain a quadratic time complexity vulnerability in the addressparser component when parsing email addresses with RFC 5322 comments. Attackers can craft malicious email headers with comment-separated atoms to consume excessive CPU and block the Node.js event loop for several seconds, causing denial of service.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 4dbeb235f78750ade54468f877165172338584d8 (Commit)

## Referenzen

- <https://github.com/nodemailer/nodemailer/security/advisories/GHSA-prgh-xp8r-p3m5>
- <https://github.com/nodemailer/nodemailer/commit/c07f17518d25aca8ab2ad66968dcbca538c24b89>
- <https://github.com/nodemailer/nodemailer/blob/v10.0.4/src/addressparser/index.ts#L251>
- <https://github.com/nodemailer/nodemailer/releases/tag/v10.0.5>
- <https://github.com/nodemailer/nodemailer>
- <https://www.vulncheck.com/advisories/nodemailer-9.1.0-through-10.0.4-denial-of-service-via-quadratic-address-parsing>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-90776) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_