Max Chernoff discovered that improperly secured shell-escape in LuaTeX may result in arbitrary shell command execution, even with shell escape disabled, if specially crafted tex files are processed.
For the stable distribution (bullseye), this problem has been fixed in version 2020.20200327.54578-7+deb11u1.
We recommend that you upgrade your texlive-bin packages.
For the detailed security status of texlive-bin please refer to its security tracker page at: https://security-tracker.debian.org/tracker/texlive-bin