CRLF injection in nodemailer - CVE-2026-82661
Published: May 27, 2026 / Updated: September 14, 2026
Vulnerability identifier: #VU132358
CSH Severity: Low
CVSS v4: 5.3 [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]
CVE-ID: CVE-2026-82661
CWE-ID: CWE-93
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
nodemailer
How to mitigate CVE-2026-82661
Install security update from vendor's website.
nodemailer - update to 8.0.9