# CVE-2026-121425: Nodemailer 3.0.0 before 10.1.4 Recipient Injection via addressparser Group Parsing

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

Nodemailer from 3.0.0 before 10.1.4 contains a parsing flaw in addressparser that ends an RFC 5322 group at a semicolon inside quoted display names or comments. Attackers can submit crafted group addresses that conformant validators approve, redirecting mail to attacker-chosen recipients and bypassing recipient allow lists.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- nodemailer / nodemailer (nodemailer): ≥ 3.0.0; < 10.1.4 (affected, semver); 10.1.4 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.3 (high); CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-20

## Exploit evidence

- exploit: https://github.com/nodemailer/nodemailer/security/advisories/GHSA-m943-m63m-w62w (ADP: CISA-ADP)

## References

- https://github.com/nodemailer/nodemailer/security/advisories/GHSA-m943-m63m-w62w (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/nodemailer-3.0.0-before-10.1.4-recipient-injection-via-addressparser-group-parsing (CNA: VulnCheck; third-party-advisory)

- https://github.com/nodemailer/nodemailer/security/advisories/GHSA-m943-m63m-w62w (ADP: CISA-ADP; exploit)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-121425; retrieved 2026-11-03; source updated 2026-11-03

Revision: b99a219c85780237797b4a7cea3a6b86df835e190e395547ba509a693f5ab27e

Canonical: https://y2.dev/cve/CVE-2026-121425

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