Inefficient Algorithmic Complexity in nodemailer - CVE-2026-90776
Published: September 30, 2026
Vulnerability identifier: #VU153017
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2026-90776
CWE-ID: CWE-407
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to inefficient algorithmic complexity in the addressparser component when parsing crafted comment-joined email addresses. A remote attacker can send a specially crafted email to cause a denial of service.
The issue is reachable through mailparser processing inbound To, From, or Cc headers.
Affected software
nodemailer
How to mitigate CVE-2026-90776
Install security update from vendor's website.
nodemailer - update to 10.0.5