Nodemailer 3.0.0 before 10.0.10 Denial of Service via SMTP Reply Parsing

Code

The project this record applies to. Exploit listings stay in References.

• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. Oct 14, 2026 · NIST NVD

   Detected

   Nodemailer from 3.0.0 before 10.0.10 contains a quadratic complexity denial of service vulnerability in the SMTP client reply parser in SMTPConnection._onData and isPartialResponse. A malicious SMTP server or on-path attacker can stream continuation lines without a completion line before authentication, blocking the Node.js event loop and exhausting memory.

2. Oct 15, 2026 · NIST NVD

   Updated

   Nodemailer from 3.0.0 before 10.0.10 contains a quadratic complexity denial of service vulnerability in the SMTP client reply parser in SMTPConnection._onData and isPartialResponse. A malicious SMTP server or on-path attacker can stream continuation lines without a completion line before authentication, blocking the Node.js event loop and exhausting memory.

Affected

• vendor nodemailer nodemailerversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-110872

  Nodemailer from 3.0.0 before 10.0.10 contains a quadratic complexity denial of service vulnerability in the SMTP client reply parser in SMTPConnection._onData and isPartialResponse. A malicious SMTP server or on-path attacker can stream continuation lines without a completion lin

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-110872

  30-day exploitation probability 0.3%

  first.org
• NIST NVDVulnerability recordCVE-2026-110872

  Nodemailer from 3.0.0 before 10.0.10 contains a quadratic complexity denial of service vulnerability in the SMTP client reply parser in SMTPConnection._onData and isPartialResponse. A malicious SMTP server or on-path attacker can stream continuation lines without a completion lin

  nvd.nist.gov

References

• Reference · github.com
• Reference · vulncheck.com