CVE-2026-82853 Nodemailer before 8.0.5 SMTP Command Injection via CRLF
Attackers can inject arbitrary SMTP commands via the transport name option, enabling email spoofing and phishing attacks.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-82853?
CVE-2026-82853 is a medium-severity command injection vulnerability in nodemailer, published on 31 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Nodemailer versions before 8.0.5 contain an SMTP command injection vulnerability in the transport name option used in EHLO/HELO commands. The name parameter is concatenated directly into SMTP commands without sanitizing carriage return and line feed characters, allowing attackers to inject arbitrary SMTP commands for email spoofing and phishing attacks.
Weakness: CWE-93
Which versions are affected by CVE-2026-82853?
2 open source packages ship an affected version, including nodemailer.
| Package | Affected | Fixed in |
|---|---|---|
nodemailer npm | All versions | 8.0.5 |
nodemailer npm | All versions | 8.0.5 |
How do I fix CVE-2026-82853?
Upgrade nodemailer to 8.0.5 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-82853 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-82853 exists.
Sources
Also known as CLEANSTART-2026-XN13622, DEBIAN-CVE-2026-82853, ECHO-2e01-a0c3-6c54, GHSA-q8rv-95x3-46j5, GHSA-vvjj-xcjg-gr5g, MINI-22wh-3chv-vj75 and 18 more.