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CVE-2026-82854

CVE-2026-82854 · Nodemailer before 8.0.3 SMTP Command Injection via envelope.size

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

Nodemailer before 8.0.4 is vulnerable to SMTP command injection through the unsanitized envelope.size parameter. When an application passes a custom envelope object with a size property containing CRLF characters to sendMail(), the value is concatenated into the SMTP MAIL FROM command (as SIZE=...) without sanitization, allowing injection of arbitrary SMTP commands such as RCPT TO to silently add attacker-controlled recipients. Exploitation requires the application to expose the envelope size to attacker-controlled input, as Nodemailer does not include size in the default auto-constructed envelope.

CVSS 9.3 · Critical · EPSS 2.0% · Fix available

Published
Updated

Stack: system · node

Affected products and versions

  • nodemailer

    Versions
    • ≥ 0, < 8.0.3: Affected (semver)
    • 8.0.3: Not affected (semver)

    Update to 8.0.3

  • 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
    • 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
    • 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
    • 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
    • 8.0.2+~7.0.11-1
    • 8.0.3+~7.0.11-1
    Affected ranges
    • ECOSYSTEM: < 8.0.4+~7.0.11-1

    Update to 8.0.4+~7.0.11-1

  • nodemailer npm

    Affected ranges
    • SEMVER: < 8.0.4

    Update to 8.0.4

  • 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

Original sources

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