Vulnerability in Nodemailer
CVE-2026-82661
Nodemailer before 8.0.9 fails to sanitize carriage return and line feed characters in list comment fields, allowing attackers to inject arbitrary message headers. An attacker with control over list.*.comment parameters can inject CRLF sequences to create additional headers in generated RFC822 messages, altering mail client behavior and message semantics.
Vulnerability class: CRLF Injection
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (16.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 16.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/nodemailer/nodemailer/security/advisories/GHSA-268h-hp4c-crq3 (vendor-advisory)
- www.vulncheck.com/advisories/nodemailer-crlf-injection-via-list-header-comments (third-party-advisory)
Frequently asked questions
- What is CVE-2026-82661?
- CVE-2026-82661 is a medium-severity vulnerability in Nodemailer, classified under CRLF Injection. CVSS score: 5.4/10. Published 2026-08-31.
- How severe is CVE-2026-82661?
- Medium severity. CVSS v3 base score is 5.4 out of 10.