nodemailer

10.2.1 · 22 Oct 2026MIT-023.7M / weekRepository Homepage npm Atom feed

Same major only

1 release in betweenevery note read

Other targets from 9.1.1Clears its 12 advisories10.1.4 Latest10.2.1

1
change to make: 0
advisories fixed: 2
new: 10
fixes

Before you upgrade

Tick each one off as you go

Node.js 20 or newer is required. The Node.js 6 syntax compatibility check and the .npmignore file are gone.
breaking10.0.0

Security

12 advisories still affect 10.0.0

Nodemailer: Quadratic (O(n^2)) DKIM header unfolding lets a large folded header cause remote denial of service during signingmoderate · GHSA-39m8-27wv-hr27
Nodemailer: Quadratic backtracking in SMTP AUTH mechanism detection regexes allows pre-auth remote denial of servicemoderate · GHSA-4ffr-jq9g-5ffx
Nodemailer: Quadratic (O(n^2)) SMTP client reply parsing lets a malicious server or MITM cause a pre-auth remote denial of servicemoderate · GHSA-4g23-2xm8-66gc

Upgrading to 10.1.4 clears them.

Release by release

10.0.0
4 Sep 20262 new · 10 fixes
- new
  Keep the @types/nodemailer type layout working
- new
  Migrate to TypeScript with ES module and CommonJS builds
- fixed
  Apply the other keys of a configuration object next to its url
- fixed
  dkim: canonicalize raw messages the way verifiers do

Upgrade to 10.0.0

npm install nodemailer@10.0.0

What 10.0.0 needs

Reading 10.0.0's manifest…

Check against your package.json

Which of your other dependencies stand in the way of 10.0.0. Read once, not stored.

After upgrading

Run the type checker, the linter and the tests.
Build, and look for new deprecation warnings.
Update peer dependencies the new version asks for.
12 advisories still affect 10.0.0.