All vulnerabilities
CVE-2026-100700GHSA-v53p-9fqp-m79j

nodemailer before 10.0.6 Denial of Service via addressparser

nodemailer nodemailernpmLibraries & packages
Open in ThreatlineRecord JSON
CVSS
8.7High
ExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 28 Sep 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.28%Chance of exploitation activity in the next 30 days, higher than 19% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in10.0.6Fixed versionCVE List
Published26 Sep 2026Updated 30 Sep 2026CVE List

What fixes it

  • 10.0.6nodemailerCVE List
  • 10.0.6nodemailer, npmOSVnpm install nodemailer@10.0.6

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

nodemailer before 10.0.6 contains a denial of service vulnerability in the addressparser free-text fallback regex pattern that exhibits quadratic backtracking behavior. Attackers can supply crafted email header values with long whitespace-free runs to block the Node.js event loop for tens of seconds, causing service unavailability.

Text from CVE List

Affected versions 3

  • nodemaileraffected: all versions before 10.0.6CVE List
  • nodemailerunaffected: 10.0.6CVE List
  • nodemailer, npmfrom first release, fixed in 10.0.6OSV

References 2