We provide security updates to the development branch and the stable branches. Security patches for old releases are available on the project website.

If you discover a security vulnerability in this project, please report it privately. Do not disclose it as a public issue. This gives us time to work with you to fix the issue before public exposure, reducing the chance that the exploit will be used before a patch is released.

You may submit a report by emailing us at xz@tukaani.org, or through Security Advisories. While both options are available, we prefer email. In any case, please provide a clear description of the vulnerability including:

• Affected versions of XZ Utils
• Estimated severity (low, moderate, high, critical)
• Steps to recreate the vulnerability
• All relevant files (core dumps, build logs, input files, etc.)

This project is maintained by a team of volunteers on a reasonable-effort basis. As such, please give us 90 days to work on a fix before public exposure.