diff --git a/SECURITY.md b/SECURITY.md
new file mode 100644
index 0000000..89a50c6
--- /dev/null
+++ b/SECURITY.md
@@ -0,0 +1,84 @@
+# Security Policy — @kyonax/org2html
+
+## Supported Versions
+
+These versions of **@kyonax/org2html** currently receive security patches and updates.
+
+| Version | Supported |
+|--------|-----------|
+| 1.x.x  | ✔️ Active (current major) |
+| 0.x.x  | ❌ Unsupported |
+
+**Note:**  
+Using semantic versioning means only the latest minor/patch versions within an active major release are guaranteed to receive fixes.
+
+---
+
+## Reporting a Vulnerability
+
+We take the security of this project seriously.  
+If you discover a security issue, please follow this responsible disclosure process.
+
+### 1. Contact Method
+
+Please report vulnerabilities privately via email:
+
+**📧 kyonax.corp@gmail.com**  
+
+Do **not** create public GitHub issues for vulnerabilities.  
+All security reports must remain private until a fix is available.
+
+---
+
+### 2. What to Include in a Report
+
+To help us investigate efficiently, please include:
+
+- A clear and concise description of the vulnerability  
+- Steps to reproduce the issue  
+- Your environment details (Node version, OS, CLI version)  
+- The potential impact (e.g., data exposure, code execution)  
+- A minimal reproducible example (if possible)
+
+---
+
+### 3. Response Time Expectations
+
+We aim to handle security reports promptly:
+
+| Stage | Expected Time |
+|-------|---------------|
+| Acknowledgement | **48–72 hours** |
+| Initial investigation | **3–7 days** |
+| Fix development | **Varies by severity** |
+| Release of security advisory | With the patch |
+
+You will receive updates throughout the entire process.
+
+---
+
+### 4. Disclosure Policy
+
+- Confirmed vulnerabilities will be fixed privately.  
+- A public **security advisory** will be published after the patch is released.  
+- Reporters may be credited for their discovery (optional).
+
+---
+
+## License & Security Expectations (LGPL v3)
+
+Since this project is licensed under **LGPL v3**, users and contributors are expected to:
+
+- Keep modifications to the library open-source  
+- Distribute security fixes under LGPL-compatible terms  
+- Avoid removing or bypassing safety or sandboxing mechanisms  
+- Inform maintainers about any discovered vulnerabilities whenever possible  
+
+This ensures the project remains safe and reliable for the entire community.
+
+---
+
+## Thank You
+
+Thank you for helping improve the security and stability of **@kyonax/org2html**.  
+Your contributions make the ecosystem safer for everyone.