SB2026052732 - Multiple vulnerabilities in nodemailer

Description

This security bulletin contains information about 2 vulnerabilities.

1) Missing Authorization (CVE-ID: N/A)

CWE-ID: CWE-862 - Missing Authorization

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote user to disclose sensitive information and induce outbound HTTP requests.

The vulnerability exists due to missing authorization in jsonTransport message normalization and shared.resolveContent() when processing user-controlled message content fields such as attachment paths or href values. A remote user can supply a specially crafted message object to disclose sensitive information and induce outbound HTTP requests.

The same root cause is also reachable when attachDataUrls is enabled and object-form html content is resolved before MIME streaming enforcement.

2) CRLF injection (CVE-ID: N/A)

CWE-ID: CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote user to inject arbitrary message headers.

The vulnerability exists due to improper neutralization of crlf sequences in List-* header comment handling when processing caller-controlled list.*.comment values. A remote user can supply a crafted comment containing CRLF characters to inject arbitrary message headers.

The issue affects the prepared-header path used for List-Help, List-Unsubscribe, List-Subscribe, List-Post, List-Owner, List-Archive, and List-ID fields.

Remediation

Install update from vendor's website.

References

• https://github.com/nodemailer/nodemailer/security/advisories/GHSA-wqvq-jvpq-h66f
• https://github.com/nodemailer/nodemailer/commit/15138a84c543c20aa399218534cdbbfa2ea1ce55
• https://github.com/nodemailer/nodemailer/security/advisories/GHSA-268h-hp4c-crq3