CVE-2026-82661
Description
A flaw was found in Nodemailer, an email sending library. This vulnerability allows a remote attacker with control over specific list comment parameters to inject arbitrary message headers into generated email messages. By failing to sanitize carriage return and line feed (CRLF) characters, an attacker can alter mail client behavior and message semantics, potentially leading to email spoofing or other integrity issues.
Statement
This is a Moderate impact vulnerability where an attacker with control over specific input fields can inject arbitrary email headers. This could alter mail client behavior or message semantics, but it does not enable remote code execution or direct SMTP command injection. Exploitation requires an application to pass unsanitized user-controlled input to the vulnerable list.*.comment parameters within the Nodemailer library.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.4 | N/A | 5.4 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Application Data
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