Mrubyc
Monthly
Null pointer dereference in mrubyc through 4.0.0 allows an attacker who can supply untrusted .mrb bytecode to crash any application embedding the VM. The op_enter() handler in src/vm.c fails to validate execution context before dereferencing, and OP_ENTER instructions placed at the top level of a crafted bytecode file - where no call frame exists - trigger the dereference and terminate the embedding application. No public exploit or active exploitation has been identified at time of analysis, and real-world risk is bounded by the requirement to feed attacker-controlled bytecode to the target application.
Null pointer dereference in mrubyc through 4.0.0 allows an attacker who can supply untrusted .mrb bytecode to crash any application embedding the VM. The op_enter() handler in src/vm.c fails to validate execution context before dereferencing, and OP_ENTER instructions placed at the top level of a crafted bytecode file - where no call frame exists - trigger the dereference and terminate the embedding application. No public exploit or active exploitation has been identified at time of analysis, and real-world risk is bounded by the requirement to feed attacker-controlled bytecode to the target application.