Youki is a container runtime written in Rust. Prior to version 0.5.5, if /proc and /sys in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem. This issue has been patched in version 0.5.5.
https://github.com/youki-dev/youki/security/advisories/GHSA-j26p-6wx7-f3pw
https://github.com/youki-dev/youki/releases/tag/v0.5.5
https://github.com/youki-dev/youki/commit/0d9b4f2aa5ceaf988f3eb568711d2acf0a4ace37