Vulnerability in Nodemailer
CVE-2026-90776
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (52.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/nodemailer/nodemailer/security/advisories/GHSA-prgh-xp8r-p3m5 (vendor-advisory)
- github.com/nodemailer/nodemailer/commit/c07f17518d25aca8ab2ad66968dcbca538c24b89 (patch)
- github.com/nodemailer/nodemailer/blob/v10.0.4/src/addressparser/index.ts (technical-description)
- github.com/nodemailer/nodemailer/releases/tag/v10.0.5 (release-notes)
- github.com/nodemailer/nodemailer (product)
- www.vulncheck.com/advisories/nodemailer-9.1.0-through-10.0.4-denial-of-service-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-90776?
- CVE-2026-90776 is a high-severity vulnerability in Nodemailer, classified under Inefficient Algorithmic Complexity. CVSS score: 7.5/10. Published 2026-09-13.
- How severe is CVE-2026-90776?
- High severity. CVSS v3 base score is 7.5 out of 10.