SB20260930100 - Multiple vulnerabilities in nodemailer

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Main Vulnerability Database SB20260930100

SB20260930100 - Multiple vulnerabilities in nodemailer

Published: September 30, 2026 Updated: October 1, 2026

Security Bulletin ID SB20260930100
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 vulnerabilities.


1) Inefficient Algorithmic Complexity (CVE-ID: CVE-2026-92596)

CWE-ID: CWE-407 - Inefficient Algorithmic Complexity

CVSSv4: 8.7 [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]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to inefficient algorithmic complexity in the addressparser result accumulator when parsing a crafted comma-separated address list. A remote attacker can provide a crafted address value to cause a denial of service.

The issue occurs on the library's default code path and requires no special application configuration or cooperating receiver.


2) Interpretation Conflict (CVE-ID: CVE-2026-92597)

CWE-ID: CWE-436 - Interpretation Conflict

CVSSv4: 8.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to an interpretation conflict in the Nodemailer address parser when processing a recipient address containing an RFC 5322 comment. A remote attacker can submit a crafted recipient address to disclose sensitive information.

Exploitation requires an application domain check that interprets the address differently from Nodemailer, such as a strict parser whose parse defects are not inspected or a prefix or substring allow-list check.


3) Interpretation Conflict (CVE-ID: CVE-2026-92598)

CWE-ID: CWE-436 - Interpretation Conflict

CVSSv4: 8.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to an interpretation conflict in the _normalizeAddress function in lib/mime-node/index.js when processing internationalized recipient domains. A remote attacker can submit a crafted recipient address that bypasses a domain allow-list to disclose sensitive information.

An invisible soft hyphen can trigger the domain-normalization discrepancy.


Remediation

Install update from vendor's website.

References