CVE-2026-90776 PUBLISHED

Nodemailer 9.1.0 through 10.0.4 Denial of Service via Quadratic Address Parsing

Assigner: VulnCheck
Reserved: 13.09.2026 Published: 13.09.2026 Updated: 13.09.2026

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 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 7.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	nodemailer
Product	nodemailer
Versions	Default: unaffected affected from 9.1.0 to 10.0.5 (excl.) Version 10.0.5 is unaffected

CVE-2026-90776 PUBLISHED

Nodemailer 9.1.0 through 10.0.4 Denial of Service via Quadratic Address Parsing

Metrics

Product Status

Credits

References

Problem Types