Remote code execution via the `pretty` option.

Description

If a remote attacker was able to control the pretty option of the pug compiler, e.g. if you spread a user provided object such as the query parameters of a request into the pug template inputs, it was possible for them to achieve remote code execution on the node.js backend.

Recommendation

Update the pug package to the latest compatible version. Followings are version details:

• Affected version(s): < 3.0.1
• Patched version(s): 3.0.1

References

• GHSA-p493-635q-r6gr
• www.npmjs.com
• CVE-2021-21353
• CWE-74
• CWE-94
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• Nuxt vulnerable to remote code execution via the browser when running the test locally - CVE-2024-34344
• Lobe Chat Desktop vulnerable to Remote Code Execution via XSS in Chat Messages - CVE-2025-59417
• FUXA Vulnerable to Unauthenticated Remote Code Execution via Script Test Mode Authorization Bypass - CVE-2026-43947
• Signal K Server Vulnerable to Remote Code Execution via Malicious npm Package - CVE-2025-68619

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How to Secure your NodeJs Express Javascript Application - part 1

How to Secure your NodeJs Express Javascript Application - part 2

10 Secure Coding Best Practices to Follow in Every Project

Tags:

npm

pug