We are currently only supporting the latest version of axolotl
Please send an e-mail to aaron@nanu-c.org explaining the vulnerability. We as the devleopers of axolotl do our best to our knowledge to avoid vulnerabilities but we also make mistakes. Axolotl run only by volunteers, so don't expect much in exchange, expect for gratful thanks in change log :). You can always ask for some axolotl stickers.