CVE-2026-100699: Node nodemailer · Nodemailer is a Node.js email-sending library
Affects node-nodemailerSource GCVE Database
Not known to be exploited · CVSS 5.3 Medium : upgrade to 10.0.9 when convenient.
Data as of 10 Nov 2026, 23:24 UTC
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 14% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 10.0.9
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 26 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.
What to do
Upgrade nodemailer to 10.0.9.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
npmnodemailerpkg:npm/nodemailerOther threats | Affected
| Fixed in
|
Ubuntu 20.04 LTSnode-nodemailerpkg:deb/ubuntu/node-nodemailer?arch=source&distro=focalOther threats | Affected
| Fixed in– |
Ubuntu 22.04 LTSnode-nodemailerpkg:deb/ubuntu/node-nodemailer?arch=source&distro=jammyOther threats | Affected
| Fixed in– |
Ubuntu 24.04 LTSnode-nodemailerpkg:deb/ubuntu/node-nodemailer?arch=source&distro=nobleOther threats | Affected
| Fixed in– |
Ubuntu 26.10node-nodemailerpkg:deb/ubuntu/node-nodemailer?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSnode-nodemailerpkg:deb/ubuntu/node-nodemailer?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Upgrade Nodemailer to version 10.0.9 or later, where this address parser vulnerability is fixed. No other mitigation is indicated or required.
Description
Nodemailer versions from 9.1.0 up to but not including 10.0.9 have a vulnerability in the address parser. This flaw mishandles email addresses with quoted local-parts followed by RFC 5322 comments, causing trailing comment-separated domain atoms to remain in the normalized address. This can lead to malformed recipient addresses in the SMTP envelope. The issue is fixed in Nodemailer version 10.0.9.
References
- github.com/nodemailer/nodemailer/security/advisories/GHSA-g57g-f23g-4646 (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-100699 (opens in a new tab)
- vulncheck.com/advisories/nodemailer-before-10.0.9-malformed-envelope-recipient-via-rfc-5322-comment (opens in a new tab)
- ubuntu.com/security/CVE-2026-100699 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-100699 (opens in a new tab)