NetHack before version 3.6.0 allowed malicious use of escaping of characters in the configuration file (usually .nethackrc) which could be exploited. This bug is patched in NetHack 3.6.0.
{ "binaries": [ { "binary_name": "nethack-common", "binary_version": "3.4.3-15build1" }, { "binary_name": "nethack-console", "binary_version": "3.4.3-15build1" }, { "binary_name": "nethack-lisp", "binary_version": "3.4.3-15build1" }, { "binary_name": "nethack-x11", "binary_version": "3.4.3-15build1" } ] }