Denial of Service Vulnerability in Nodemailer Affects Node.js Applications
CVE-2026-100700

8.7HIGH

Key Information:

Vendor

Nodemailer

Status
Nodemailer
Vendor
CVE Published:
26 September 2026

What is CVE-2026-100700?

The vulnerability found in Nodemailer versions prior to 10.0.6 involves a denial of service due to the quadratic backtracking behavior of the addressparser's fallback regex pattern. When an attacker sends specially crafted email header values with extensive whitespace-free runs, it can severely impact the Node.js event loop, causing significant service interruptions and unavailability for extended periods.

Affected Version(s)

nodemailer 0 < 10.0.6

nodemailer 10.0.6

References

https://github.com/nodemailer/nodemailer/security/advisor...
vendor-advisory
https://www.vulncheck.com/advisories/nodemailer-before-10...
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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