Nodemailer versions 9.1.0 through 10.0.4 contain a quadratic time complexity vulnerability in the addressparser component when parsing email… (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.
AI Analysis
Technical Summary
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, specially crafted email headers with comment-separated atoms can cause excessive CPU consumption, blocking the Node.js event loop for several seconds and resulting in denial of service. This vulnerability is tracked as CVE-2026-90776 and has a CVSS 3.1 base score of 7.5, indicating high severity.
Potential Impact
Exploitation of this vulnerability allows an unauthenticated attacker to cause a denial of service by sending maliciously crafted email headers that trigger excessive CPU usage and block the Node.js event loop, potentially disrupting services relying on Nodemailer for email processing.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch is available, consider implementing input validation or rate limiting on email headers to mitigate potential denial of service attacks.
Nodemailer versions 9.1.0 through 10.0.4 contain a quadratic time complexity vulnerability in the addressparser component when parsing email… (CVE-2026-90776)
Description
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 v3.1
Score 7.5high
Affected software
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
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, specially crafted email headers with comment-separated atoms can cause excessive CPU consumption, blocking the Node.js event loop for several seconds and resulting in denial of service. This vulnerability is tracked as CVE-2026-90776 and has a CVSS 3.1 base score of 7.5, indicating high severity.
Potential Impact
Exploitation of this vulnerability allows an unauthenticated attacker to cause a denial of service by sending maliciously crafted email headers that trigger excessive CPU usage and block the Node.js event loop, potentially disrupting services relying on Nodemailer for email processing.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch is available, consider implementing input validation or rate limiting on email headers to mitigate potential denial of service attacks.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-vm5r-23w9-m8hx
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-90776"]
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6aa741a155bf5e2cf5489bce
Added to database: 09/14/2026, 00:36:49 UTC
Last enriched: 09/14/2026, 00:41:27 UTC
Last updated: 09/14/2026, 02:21:32 UTC
Views: 3
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.