chore(deps): update dependency nodemailer to v6.9.9 [security]#188

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renovate/npm-nodemailer-vulnerability

renovate bot commented Feb 5, 2026

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
nodemailer (source)	`6.3.1` → `6.9.9`

Warning

Some dependencies could not be looked up. Check the warning logs for more information.

GitHub Vulnerability Alerts

CVE-2020-7769

This affects the package nodemailer before 6.4.16. Use of crafted recipient email addresses may result in arbitrary command flag injection in sendmail transport for sending mails.

CVE-2021-23400

The package nodemailer before 6.6.1 are vulnerable to HTTP Header Injection if unsanitized user input that may contain newlines and carriage returns is passed into an address object.

GHSA-9h6g-pr28-7cqp

Summary

A ReDoS vulnerability occurs when nodemailer tries to parse img files with the parameter attachDataUrls set, causing the stuck of event loop.
Another flaw was found when nodemailer tries to parse an attachments with a embedded file, causing the stuck of event loop.

Details

Regex: /^data:((?:[^;];)(?:[^,])),(.)$/

Path: compile -> getAttachments -> _processDataUrl

Regex: /(<img\b[^>]* src\s*=[\s"']*)(data:([^;]+);[^"'>\s]+)/

Path: _convertDataImages

PoC

https://gist.github.com/francoatmega/890dd5053375333e40c6fdbcc8c58df6
https://gist.github.com/francoatmega/9aab042b0b24968d7b7039818e8b2698

async function exploit() {
   const MailComposer = require(\"nodemailer/lib/mail-composer\");
   const MailComposerObject = new MailComposer();

   // Create a malicious data URL that will cause excessive backtracking
   // This data URL is crafted to have a long sequence of characters that will cause the regex to backtrack
   const maliciousDataUrl = 'data:image/png;base64,' + 'A;B;C;D;E;F;G;H;I;J;K;L;M;N;O;P;Q;R;S;T;U;V;W;X;Y;Z;'.repeat(1000) + '==';

   // Call the vulnerable method with the crafted input
   const result = await MailComposerObject._processDataUrl({ path: maliciousDataUrl });
}

await exploit();

Impact

ReDoS causes the event loop to stuck a specially crafted evil email can cause this problem.

Release Notes

nodemailer/nodemailer (nodemailer)

`v6.9.9`

Bug Fixes

security: Fix issues described in GHSA-9h6g-pr28-7cqp. Do not use eternal matching pattern if only a few occurences are expected (dd8f5e8)
tests: Use native node test runner, added code coverage support, removed grunt (#1604) (be45c1b)

`v6.9.8`

Bug Fixes

punycode: do not use native punycode module (b4d0e0c)

`v6.9.7`

Bug Fixes

customAuth: Do not require user and pass to be set for custom authentication schemes (fixes #1584) (41d482c)

`v6.9.6`

Bug Fixes

inline: Use 'inline' as the default Content Dispostion value for embedded images (db32c93)
tests: Removed Node v12 from test matrix as it is not compatible with the test framework anymore (7fe0a60)

`v6.9.5`

Bug Fixes

license: Updated license year (da4744e)

`v6.9.4`

Renamed SendinBlue to Brevo

`v6.9.3`

Specified license identifier (was defined as MIT, actual value MIT-0)
If SMTP server disconnects with a message, process it and include as part of the response error

`v6.9.2`

Fix uncaught exception on invalid attachment content payload

`v6.9.1`

Bug Fixes

addressparser: Correctly detect if user local part is attached to domain part (f2096c5)

`v6.9.0`

Do not throw if failed to resolve IPv4 addresses
Include EHLO extensions in the send response
fix sendMail function: callback should be optional

`v6.8.0`

Add DNS timeout (huksley)
add dns.REFUSED (lucagianfelici)

`v6.7.8`

Allow to use multiple Reply-To addresses

`v6.7.7`

Resolver fixes

`v6.7.6`

`v6.7.5`

No changes, pushing a new README to npmjs.org

`v6.7.4`

Ensure compatibility with Node 18
Replaced Travis with Github Actions

`v6.7.3`

Typo fixes
Added stale issue automation fir Github
Add Infomaniak config to well known service (popod)
Update Outlook/Hotmail host in well known services (popod)
fix: DSN recipient gets ignored (KornKalle)

`v6.7.2`

Fix proxies for account verification

`v6.7.1`

fix verify on ses-transport (stanofsky)

`v6.7.0`

Updated DNS resolving logic. If there are multiple responses for a A/AAAA record, then loop these randomly instead of only caching the first one

`v6.6.5`

Replaced Object.values() and Array.flat() with polyfills to allow using Nodemailer in Node v6+

`v6.6.4`

Better compatibility with IPv6-only SMTP hosts (oxzi)
Fix ses verify for sdk v3 (hannesvdvreken)
Added SECURITY.txt for contact info

`v6.6.3`

Do not show passwords in SMTP transaction logs. All passwords used in logging are replaced by "/* secret */"

`v6.6.2`

`v6.6.1`

Fixed address formatting issue where newlines in an email address, if provided via address object, were not properly removed. Reported by tmazeika (#1289)

`v6.6.0`

Added new option newline for MailComposer
aws ses connection verification (Ognjen Jevremovic)

`v6.5.0`

Pass through textEncoding to subnodes
Added support for AWS SES v3 SDK
Fixed tests

`v6.4.18`

Updated README

`v6.4.17`

Allow mixing attachments with caendar alternatives

`v6.4.16`

Applied updated prettier formating rules

`v6.4.15`

Minor changes in header key casing

`v6.4.14`

Disabled postinstall script

`v6.4.13`

Fix normalizeHeaderKey method for single node messages

`v6.4.12`

Better handling of attachment filenames that include quote symbols
Includes all information from the oath2 error response in the error message (Normal Gaussian) [1787f22]

`v6.4.11`

Fixed escape sequence handling in address parsing

`v6.4.10`

Fixed RFC822 output for MailComposer when using invalid content-type value. Mostly relevant if message attachments have stragne content-type values set.

`v6.4.8`

`v6.4.7`

Always set charset=utf-8 for Content-Type headers
Catch error when using invalid crypto.sign input

`v6.4.6`

fix: requeueAttempts=n should requeue n times (Patrick Malouin) [a27ed2f]

`v6.4.5`

`v6.4.4`

Add options.forceAuth for SMTP (Patrick Malouin) [a27ed2f]

`v6.4.3`

Added an option to specify max number of requeues when connection closes unexpectedly (Igor Sechyn) [8a927f5]

`v6.4.2`

Fixed bug where array item was used with a potentially empty array

`v6.4.1`

Updated README

`v6.4.0`

Do not use auth if server does not advertise AUTH support [f419b09]
add dns.CONNREFUSED (Hiroyuki Okada) [5c4c8ca]

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          chore(deps): update dependency nodemailer to v6.9.9 [security]

690ba84

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