CVE-2026-90776 Nodemailer - Denial of Service

Nodemailer 9.1.0 through 10.0.4 contains a denial of service caused by quadratic time complexity in the addressparser component when parsing email addresses with RFC 5322 comments, letting attackers block the Node.js event loop, exploit requires crafted email headers.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.68% 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
13 September 2026
Updated
15 October 2026
Weakness
CWE-407

Vendor fix

Update to a version later than 10.0.4.

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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