An issue was discovered in mruby 1.4.1. There is a NULL pointer dereference in mrbclass, related to certain .clone usage, because mrbobjclone in kernel.c copies flags other than the MRBFLAGISFROZEN flag (e.g., the embedded flag).

An issue was discovered in mruby 1.4.1. There is a heap-based buffer over-read associated with OPENTER because mrbgems/mruby-fiber/src/fiber.c does not extend the stack in cases of many arguments to fiber.

The CHECK macro in mrbgems/mruby-sprintf/src/sprintf.c in mruby 1.4.1 contains a signed integer overflow, possibly leading to out-of-bounds memory access because the mrbstrresize function in string.c does not check for a negative length.

An issue was discovered in mruby 1.4.1. There is a NULL pointer dereference in mrbclassreal because "class BasicObject" is not properly supported in class.c.

The initcopy function in kernel.c in mruby 1.4.1 makes initializecopy calls for TTICLASS objects, which allows attackers to cause a denial of service (mrbhashkeys uninitialized pointer and application crash) or possibly have unspecified other impact.