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CVE-2026-100699

CVE-2026-100699 · Nodemailer before 10.0.9 Malformed Envelope Recipient via RFC 5322 Comment

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

Nodemailer is a Node.js email-sending library. In versions >= 9.1.0 and < 10.0.9, the address parser (src/addressparser) mishandles addresses whose local-part is a quoted string and that are followed by RFC 5322 comments, allowing trailing comment-separated domain atoms to be retained in the normalized address. For example, the input "user"@example.com(x)evil.com is parsed to the address value '[email protected] evil.com', which contains additional attacker-controlled domain text separated by a literal space. This parsed value is used without further strict recipient validation when the message envelope is built (envelope.to in src/mime-node), so a malformed/ambiguous recipient address can be accepted and placed in the SMTP envelope. Whether this results in delivery to an unintended recipient on real SMTP servers has not been confirmed. The issue is a variant of the RFC 5322 comment parsing problem addressed in GHSA-cc9r-2j5m-2m83, affecting the separate quoted-local-part code path. Version 10.0.9 contains a fix.

CVSS 6.9 · Medium · EPSS 0.2% · Fix available

Published
Updated

Stack: system · node

Affected products and versions

  • nodemailer

    Versions
    • ≥ 9.1.0, < 10.0.9: Affected (semver)
    • 10.0.9: Not affected (semver)

    Update to 10.0.9

  • 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
    • 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
    • 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: ≥ 9.1.0, < 10.0.9

    Update to 10.0.9

  • 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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