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CVE-2026-110871

CVE-2026-110871 · Nodemailer 3.0.0 before 10.0.10 Quadratic DKIM Header Unfolding Denial of Service

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Nodemailer from 3.0.0 before 10.0.10 contains a denial of service vulnerability in MessageParser.parseHeaders that allows users to exhaust CPU through quadratic header unfolding. Attackers can supply large recipient lists or long headers that fold into tens of thousands of continuation lines, blocking the Node.js event loop during DKIM signing.

CVSS 7.1 · High · EPSS 0.3% · Public exploit · Fix available

Published
Updated

Stack: system · node

Affected products and versions

  • nodemailer

    Versions
    • ≥ 3.0.0, < 10.0.10: Affected (semver)
    • 10.0.10: Not affected (semver)

    Update to 10.0.10

  • node-nodemailer Debian:12

    Versions
    • 10.0.0+~8.0.1-1
    • 10.0.10+~8.0.1-1
    • 10.0.10+~8.0.2-1
    • 10.0.13+~8.0.2-1
    • 10.0.14+~8.0.2-1
    • 10.1.7+~8.0.2-1
    • 6.10.0+~6.4.17-1
    • 6.8.0+~6.4.6-1
    • 6.9.13+~6.4.14-1
    • 6.9.15+~6.4.16-1
    • 6.9.16+~6.4.16-1
    • 6.9.4+~6.4.9-1
    • 6.9.4+~6.4.9-2
    • 6.9.4+~6.4.9-3
    • 6.9.4+~6.4.9-4
    • 7.0.10+~7.0.2-1
    • 7.0.12+~7.0.5-1
    • 7.0.5+~7.0.1-1
    • 7.0.6+~7.0.1-1
    • 7.0.9+~7.0.2-1
    • 7.0.9+~7.0.2-2
    • 8.0.11+~8.0.1-1
    • 8.0.2+~7.0.11-1
    • 8.0.3+~7.0.11-1
    • 8.0.4+~7.0.11-1
    • 8.0.4+~7.0.11-2
    • 9.0.0+~8.0.1-1
    • 9.0.3+~8.0.1-1
    • 9.0.5+~8.0.1-1
    • 9.0.6+~8.0.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-nodemailer Debian:13

    Versions
    • 10.0.0+~8.0.1-1
    • 10.0.10+~8.0.1-1
    • 10.0.10+~8.0.2-1
    • 10.0.13+~8.0.2-1
    • 10.0.14+~8.0.2-1
    • 10.1.7+~8.0.2-1
    • 6.10.0+~6.4.17-1
    • 6.10.0+~6.4.17-1+deb13u1
    • 7.0.10+~7.0.2-1
    • 7.0.12+~7.0.5-1
    • 7.0.5+~7.0.1-1
    • 7.0.6+~7.0.1-1
    • 7.0.9+~7.0.2-1
    • 7.0.9+~7.0.2-2
    • 8.0.11+~8.0.1-1
    • 8.0.2+~7.0.11-1
    • 8.0.3+~7.0.11-1
    • 8.0.4+~7.0.11-1
    • 8.0.4+~7.0.11-2
    • 9.0.0+~8.0.1-1
    • 9.0.3+~8.0.1-1
    • 9.0.5+~8.0.1-1
    • 9.0.6+~8.0.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-nodemailer Debian:14

    Versions
    • 10.0.0+~8.0.1-1
    • 6.10.0+~6.4.17-1
    • 7.0.10+~7.0.2-1
    • 7.0.12+~7.0.5-1
    • 7.0.5+~7.0.1-1
    • 7.0.6+~7.0.1-1
    • 7.0.9+~7.0.2-1
    • 7.0.9+~7.0.2-2
    • 8.0.11+~8.0.1-1
    • 8.0.2+~7.0.11-1
    • 8.0.3+~7.0.11-1
    • 8.0.4+~7.0.11-1
    • 8.0.4+~7.0.11-2
    • 9.0.0+~8.0.1-1
    • 9.0.3+~8.0.1-1
    • 9.0.5+~8.0.1-1
    • 9.0.6+~8.0.1-1
    Affected ranges
    • ECOSYSTEM: < 10.0.10+~8.0.1-1

    Update to 10.0.10+~8.0.1-1

  • nodemailer npm

    Affected ranges
    • SEMVER: ≥ 3.0.0, < 10.0.10

    Update to 10.0.10

  • node-nodemailer Ubuntu:20.04:LTS

    Versions
    • 6.3.0-2
    • 6.3.1-1
    • 6.4.0-1
    • 6.4.1-1
    • 6.4.2-1
    • 6.4.5-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-nodemailer Ubuntu:22.04:LTS

    Versions
    • 6.4.17-3
    • 6.7.0-1
    • 6.7.0-2
    • 6.7.1+~6.4.4-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-nodemailer Ubuntu:24.04:LTS

    Versions
    • 6.9.4+~6.4.9-2
    • 6.9.4+~6.4.9-3ubuntu1
    • 6.9.4+~6.4.9-4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-nodemailer Ubuntu:26.10

    Versions
    • 8.0.4+~7.0.11-1
    • 8.0.4+~7.0.11-2
    • 9.0.0+~8.0.1-1
    • 9.0.3+~8.0.1-1
    • 9.0.5+~8.0.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-nodemailer Ubuntu:26.04:LTS

    Versions
    • 7.0.5+~7.0.1-1
    • 7.0.9+~7.0.2-2
    • 7.0.10+~7.0.2-1
    • 7.0.12+~7.0.5-1
    • 8.0.4+~7.0.11-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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