MediumVulnerabilityGHSA-4g23-2xm8-66gcupdated 27 Oct 2026, 15:05 UTC
Nodemailer: Quadratic (O(n^2)) SMTP client reply parsing lets a malicious server or MITM cause a pre-auth remote denial of service
Fixed in nodemailer 10.0.10Official source
| Severity | MediumCVSS 5.9 of 10 |
|---|---|
| Being exploited? | UnclearNo reports either way yet |
| Fix available? | Yesnodemailer 10.0.10 · since 27 Oct 2026 |
| How sure is this? | Official sourceBacked by an official source |
Are you affected?
| Package / product | Affected versions | Fixed in |
|---|---|---|
| nodemailer · npm | >= 3.0.0, <= 10.0.9 | 10.0.10 |
Timeline
- 27 Oct 2026, 15:04 UTCPublicly disclosed
- 27 Oct 2026, 15:04 UTCReported by GitHub Advisory · GitHub Advisory
- 27 Oct 2026, 15:05 UTCPicked up by Zero Radar
Sources 1 report, oldest first
Official vendor, government CERT or advisory database
- Nodemailer: Quadratic (O(n^2)) SMTP client reply parsing lets a malicious server or MITM cause a pre-auth remote denial of serviceGitHub Advisory · 27 Oct 2026, 15:04 UTC
Technical details
- ID
- GHSA-4g23-2xm8-66gc
- CVSS
- 5.9 / 10
- Disclosed
- 27 Oct 2026, 15:04 UTC
- On Zero Radar
- 27 Oct 2026, 15:05 UTC (1 min after disclosure)
- Last change
- 27 Oct 2026, 15:05 UTC
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