Buffer overflow in mtr 0.46 and earlier, when installed setuid root, allows local users to access a raw socket via a long MTR_OPTIONS environment variable.

Off-by-one error in the mtr_curses_keyaction function for mtr 0.55 through 0.65 allows local users to hijack raw sockets, as demonstrated using the "s" keybinding, which leaves a buffer without a NULL terminator.