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Back to active CVEs
High · CVSS 8.3CVE-2026-121424

Nodemailer 3.0.0 before 10.1.4 Address Parsing Bypass via Nested CommentsCVE-2026-121424

Answer in brief

CVE-2026-121424 records a High severity (CVSS 8.3) vulnerability in Nodemailer 3.0.0 before 10.1.4 Address Parsing Bypass via Nested Comments. The current sources do not mark it as known exploited. The current feed maps nodemailer/nodemailer (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 3, 2026Updated Nov 3, 2026Source checked Nov 3, 2026First seen by HOL Nov 3, 2026Material review Nov 3, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps nodemailer/nodemailer (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
nodemailer/nodemailergeneric>=3.0.0 <10.1.410.1.4

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for nodemailer/nodemailer.
  2. 2Review the reported fix. Update nodemailer/nodemailer to 10.1.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 3, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-20
Source
CVE List V5
Source checked
Nov 3, 2026
References
2 linked sources
Open source record