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Medium

Header injection in nodemailer

  • Disclosed: 10.12.2021
  • Updated: 11.10.2026 10:22

The package nodemailer before 6.6.1 are vulnerable to HTTP Header Injection if unsanitized user input that may contain newlines and carriage returns is passed into an address object.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
npm package nodemailer < 6.6.1 6.6.1

References

CVSS score 6.3/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Weakness (CWE)
CWE-74
Platform
npm
Package
nodemailer
Disclosed
10.12.2021
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-hwqf-gcqm-7353 - CC BY 4.0

Vulnerability history: nodemailer

All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (20) in the archive
Total entries
20
First → latest
05.2021 09.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 1
  • High 6
  • Medium 12
  • Low 1

Disclosures per year

Severity:
  1. Nodemailer addressparser: O(n^2) on comment-joined addresses enables a remote DoS (reachable via mailparser)
    High · 7.5 CVE-2026-90776 >= 9.1.0, < 10.0.5 10.0.5
  2. Nodemailer: Quadratic backtracking in the addressparser free-text fallback allows remote denial of service
    High · 7.5 CVE-2026-100700 < 10.0.6 10.0.6
  3. Nodemailer: Quadratic (O(n²)) time complexity in addressparser allows remote denial of service via a crafted address list
    High · 7.5 CVE-2026-92596 < 9.1.0 9.1.0
  4. Nodemailer: Message-level raw option bypasses disableFileAccess/disableUrlAccess, enabling arbitrary file read and full-response SSRF in the delivered message
    High · 7.1 CVE-2026-82659 < 9.0.1 9.0.1
  5. Nodemailer: Improper TLS Certificate Validation in OAuth2 Token Fetch Enables Credential Interception
    High · 6.5 CVE-2026-82662 < 8.0.8 8.0.8
  6. Nodemailer’s addressparser is vulnerable to DoS caused by recursive calls
    High · 7.5 CVE-2025-14874 >= 3.0.0, < 7.0.11 7.0.11
  7. Header injection in nodemailer this entry
    Medium · 6.3 CVE-2021-23400 < 6.6.1 6.6.1
  8. Command injection in nodemailer
    Critical · 9.8 CVE-2020-7769 < 6.4.16 6.4.16

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