CVE-2026-92596

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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
nodemailernodemailer
𝑥
< 9.1.0
CNA
Common Weakness Enumeration
References
https://github.com/nodemailer/nodemailer/commit/34da642
https://github.com/nodemailer/nodemailer/commit/7cc38af
https://github.com/nodemailer/nodemailer/commit/83b8c48
https://github.com/nodemailer/nodemailer/commit/9116da9
https://github.com/nodemailer/nodemailer/security/advisories/GHSA-2x7j-588g-ccc2
https://www.vulncheck.com/advisories/nodemailer-before-9.1.0-denial-of-service-via-addressparser