CVE-2026-48019 CRLF injection in Laravel's default email rule enables SMTP smuggling and spoofed-mail relay
Unauthenticated attackers can inject CRLF sequences to smuggle SMTP commands and spoof emails in Laravel applications sending mail to user-supplied addresses.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-48019?
CVE-2026-48019 is a high-severity vulnerability in laravel framework, published on 4 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Laravel is a web application framework. Prior to versions 12.60.0 and 13.10.0, a CRLF injection vulnerability in Laravel's email validation, in combination with how Symfony Mailer and Symfony Mime handle certain character sequences, may allow an unauthenticated attacker to interfere with outbound email processing in applications that send mail to user-supplied addresses. This issue has been patched in versions 12.60.0 and 13.10.0.
Weakness: CWE-93
Which versions are affected by CVE-2026-48019?
4 open source packages ship an affected version, including laravel/framework.
| Package | Affected | Fixed in |
|---|---|---|
laravel/framework Packagist | All versions | 12.60.0 |
laravel/framework Packagist | All versions | 12.60.0 |
laravel/framework Packagist | From 13.0.0 | 13.10.0 |
laravel/framework Packagist | From 13.0.0 | 13.10.0 |
How do I fix CVE-2026-48019?
Upgrade laravel/framework to a fixed version for your release line: 12.60.0 or 13.10.0.
Is CVE-2026-48019 being exploited?
There is no known exploitation of CVE-2026-48019 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as CLSA-2026-1782954027, CLSA-2026-1782954039, CLSA-2026-1783040462, CLSA-2026-1783299702, CLSA-2026-1783299711, CLSA-2026-1783558965 and 11 more.