"a crash caused by malformed input" absolutely does sound like a DoS, though. Sounds like you have a crash that you think might be exploitable- in that case, c

"a crash caused by malformed input" absolutely does sound like a DoS, though. Sounds like you have a crash that you think might be exploitable- in that case, consider saying "memory corruption triggered by malformed input" to make it more clear that the crash isn't the point.