Is CVE-2026-121425 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-121425 being exploited in the wild.

How severe is CVE-2026-121425?

Medium severity, with a CVSS score of 6.5, published 3 November 2026.

Which products and versions are affected?

Nodemailer Project Nodemailer 3.0.0 to 10.1.3.

Is there a fix for CVE-2026-121425?

Yes: fixed in 10.1.4. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-121425 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-121425?

Check whether you run Nodemailer Project Nodemailer at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-121425: Nodemailer addressparser recipient injection via group parsing

CVE-2026-121425 · Severity: medium · CVSS 6.5 · Published 2026-11-03

Nodemailer is a Node.js library for sending emails. A parsing flaw in its address handling allows attackers to craft email addresses that bypass recipient validation checks, causing mail to be sent to attacker-controlled addresses instead of legitimate recipients. This enables mail interception and disclosure of sensitive content intended for approved recipients.

Technologies: Nodemailer Project Nodemailer. Vendors: Nodemailer Project.

Quick answers

Is CVE-2026-121425 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-121425 being exploited in the wild.
How severe is CVE-2026-121425?: Medium severity, with a CVSS score of 6.5, published 3 November 2026.
Which products and versions are affected?: Nodemailer Project Nodemailer 3.0.0 to 10.1.3.
Is there a fix for CVE-2026-121425?: Yes: fixed in 10.1.4. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-121425 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-121425?: Check whether you run Nodemailer Project Nodemailer at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 10.1.4

Technical details

The addressparser component incorrectly terminates RFC 5322 address groups at a semicolon appearing within quoted display names or comments, causing the text after the semicolon to be re-parsed as top-level recipients with inverted quoting. An attacker can craft addresses like G: (a; <evil@evil.com>) <v@victim.com>; which conformant RFC 5322 parsers read as v@victim.com but Nodemailer interprets as evil@evil.com, bypassing allowlist validation.

Affected products

Nodemailer Project Nodemailer 3.0.0 to 10.1.3

Timeline

2026-10-19: disclosed
2026-11-03: advisory

References

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