SB20260930105 - Multiple vulnerabilities in nodemailer

Description

This security bulletin contains information about 2 vulnerabilities.

1) Inefficient Algorithmic Complexity (CVE-ID: N/A)

CWE-ID: CWE-407 - Inefficient Algorithmic Complexity

CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

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

The vulnerability exists due to inefficient algorithmic complexity in the DKIM message parser's header-unfolding loop when DKIM-signing an outbound message with a header folded into many continuation lines. A remote user can supply a large header value to cause a denial of service.

DKIM signing must be enabled.

2) Inefficient Algorithmic Complexity (CVE-ID: N/A)

CWE-ID: CWE-407 - Inefficient Algorithmic Complexity

CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/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 SMTP client response parser when processing multiline SMTP server replies. A remote attacker can stream continuation lines without a completion line to cause a denial of service.

The issue is reachable during SMTP greeting and EHLO reply processing before client authentication.

Remediation

Install update from vendor's website.

References

• https://github.com/nodemailer/nodemailer/security/advisories/GHSA-39m8-27wv-hr27
• https://github.com/nodemailer/nodemailer/security/advisories/GHSA-4g23-2xm8-66gc