Code Security Guidelines

How It Works

1. When you write or review code, reference these security guidelines
2. Each rule includes incorrect (vulnerable) and correct (secure) code examples
3. Rules are organized by vulnerability category and impact level

Categories

Critical Impact

• SQL Injection - Use parameterized queries, never concatenate user input
• Command Injection - Avoid shell commands with user input, use safe APIs
• XSS - Escape output, use framework protections
• XXE - Disable external entities in XML parsers
• Path Traversal - Validate and sanitize file paths
• Insecure Deserialization - Never deserialize untrusted data
• Code Injection - Never eval() user input
• Hardcoded Secrets - Use environment variables or secret managers
• Memory Safety - Prevent buffer overflows, use-after-free (C/C++)

High Impact

• Insecure Crypto - Use SHA-256+, AES-256, avoid MD5/SHA1/DES
• Insecure Transport - Use HTTPS, verify certificates
• SSRF - Validate URLs, use allowlists
• JWT Issues - Always verify signatures
• CSRF - Use CSRF tokens on state-changing requests
• Prototype Pollution - Validate object keys in JavaScript

Infrastructure

• Terraform AWS/Azure/GCP - Encryption, least privilege, no public access
• Kubernetes - No privileged containers, run as non-root
• Docker - Don't run as root, pin image versions
• GitHub Actions - Avoid script injection, pin action versions

Usage

rules/

• rules/sql-injection.md

  - SQL injection prevention

• rules/xss.md

  - Cross-site scripting prevention

• rules/command-injection.md

  - Command injection prevention

• rules/_sections.md

  - Full index of all 28 rule categories

Quick Reference