CVE-2026-100700 Nodemailer - Denial of Service

Nodemailer < 10.0.6 contains a denial of service caused by quadratic backtracking in the addressparser free-text fallback regex pattern, letting attackers block the Node.js event loop causing service unavailability, exploit requires crafted email header values with long whitespace-free runs.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.28% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
26 September 2026
Updated
15 October 2026
Weakness
CWE-407

Vendor fix

Upgrade to version 10.0.6 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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