TI-2026-84306 Aliases CVE-2026-121424 GHSA-f6c5-wvmr-hc29

Address parsing bypass in Nodemailer via nested comments

LOW 36CWE-20Published 2026-11-03 · Updated 2026-11-03

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Attack requirements: Present
Impact type: —
Confidentiality · integrity · availability: High · Low · None
Fix status: Partial Red Hat: 3 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

Summary

Nodemailer from 3.0.0 before 10.1.4 contains an address parsing flaw in addressparser, where nested RFC 5322 comments end at the first closing parenthesis (CWE-20). A remote attacker who can submit addresses can hide an attacker address inside a nested comment, bypassing conformant validators and recipient allow lists to receive mail or spoof senders in mailparser.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

Nodemailer from 3.0.0 before 10.1.4 contains an address parsing vulnerability in addressparser that allows remote attackers to redirect recipients by ending nested RFC 5322 comments at the first closing parenthesis. Attackers can submit addresses whose nested comment hides an attacker address, bypassing conformant validators and recipient allow lists to receive mail or spoof senders in mailparser.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00337 27th percentileScored 2026-11-07

Fix Partial nodemailer (nodemailer): 10.1.4Red Hat: 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
nodemailer	nodemailer	3.0.0 to before 10.1.4	10.1.4	Patch available	CNA

nodemailer Vendornodemailer Affected 3.0.0 to before 10.1.4 Fixed in 10.1.4 Patch available CNA

Remediation

Upgrade Nodemailer to version 10.1.4. Red Hat has no fix plan available for Red Hat Developer Hub 1, Red Hat Enterprise Linux 10 and Self-service automation portal 2.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Fix · CNA nodemailer (nodemailer) Fixed in 10.1.4

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-11-03
nodemailer 10.1.4
3 records Highest priority Priority HIGH 2 HIGH, 1 LOW
Other records, highest priority first
- TI-2026-84308 Nodemailer addressparser flaw delivers mail to attacker domainsPriority HIGH 69
- TI-2026-84307 Recipient injection in Nodemailer addressparser group parsingPriority HIGH 69
Show all 3 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Developer Hub 1	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 10	Affected	No fix yet: Fix deferred
Self-service automation portal 2	Affected	No fix yet: Fix deferred

Not affected: 1 product

Red Hat Hardened Images

Timeline

2026-11-03 Threatist record created from CVE-2026-121424
2026-11-03 Alias added: GHSA-f6c5-wvmr-hc29
2026-11-03 CISA SSVC decision points changed
2026-11-03 Priority changed: MEDIUM → LOW
2026-11-04 Affected versions changed · Red Hat
2026-11-04 CVSS score added · Red Hat

References

Advisory 1

GitHub Security Advisory (GHSA-8c8m-p3m8-cjg8)

TI-2026-74559 ReDoS in Nodemailer SMTP AUTH mechanism detection regexes CVSS 4.0HIGH 8.7
TI-2026-64856 nodemailer before 10.0.6 Denial of Service via addressparser CVSS 4.0HIGH 8.7
TI-2026-62452 Nodemailer before 9.1.0 Denial of Service via addressparser CVSS 4.0HIGH 8.7
TI-2026-61683 Nodemailer 9.1.0 through 10.0.4 Denial of Service via Quadratic Address Parsing CVSS 4.0HIGH 8.7
TI-2025-13566 Nodemailer: nodemailer: denial of service via crafted email address header CVSS 3.1HIGH 7.5
TI-2026-74560 Nodemailer address parser passes illegal characters to SMTP envelope CVSS 4.0MEDIUM 6.9

See all 27 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences