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CVE-2026-42533 — Vulnerabilidad en NGINX | Kitploit
Tools/GitHubGitHub/seguridadentrerios/cve-2026-42533
Vulnerability ScannersVulnerability AnalysisConfiguration AuditingWeb SecurityLearning & Education
GitHubseguridadentrerios/cve-2026-42533

CVE-2026-42533

Vulnerabilidad en NGINX

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129 days agoNot yet reviewed

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NGINX Vulnerability Checker

Script to non-intrusively check if an NGINX installation could be affected by vulnerability CVE-2026-42533.

Important: This project does not exploit the vulnerability. It only performs local checks on the installed version and server configuration to identify potential exposures.

Features

  • Detects if NGINX is installed.
  • Gets the installed version.
  • Compares the version with patched versions.
  • Searches for configurations using the map directive.
  • Detects the use of regular expressions (~ and ~*) in configuration files.
  • Generates a summary of the installation status.

Requirements

  • Linux
  • Bash
  • NGINX installed
  • Read permissions over /etc/nginx

Usage

Grant execution permissions:

root@kitploit:~
chmod +x nginx_checker.sh

Execute:

root@kitploit:~
./nginx_checker.sh

Example Output

root@kitploit:~
========================================
 Verificación de vulnerabilidad NGINX
========================================

[+] Versión instalada: 1.30.2

[!] La versión podría ser vulnerable.

Buscando configuraciones potencialmente afectadas...

[+] Se encontró directiva 'map' en:
    /etc/nginx/nginx.conf

[+] Se encontraron expresiones regulares en:
    /etc/nginx/conf.d/default.conf

[!] La configuración utiliza directivas que podrían verse afectadas.
    Revise manualmente la configuración.

Recomendación:
  - Actualizar a una versión corregida.
  - Revisar reglas 'map' con expresiones regulares.

Limitations

This script does not confirm the existence of the vulnerability.

The check is based on:

  • The installed version of NGINX.
  • Analysis of the local configuration.

The vulnerability depends on specific configuration conditions, so only a manual review or an update to a patched version can completely rule out the risk.

Recommendations

  • Update to a patched version of NGINX.
  • Review map rules that use regular expressions.
  • Keep the software updated through the vendor's official channels.

Disclaimer

This project is for educational and defensive audit purposes. The author is not responsible for misuse of the software.

References

  • NGINX Security Advisories
  • CVE-2026-42533
  • https://blog.segu-info.com.ar/2026/07/vulnerabilidad-critica-de-nginx.html

License

MIT License

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