Espruino before 1.98 allows attackers to cause a denial of service (application crash) with a user crafted input file via a NULL pointer dereference during syntax parsing. This was addressed by adding validation for a debug trace print statement in jsvar.c.

Espruino before 1.99 allows attackers to cause a denial of service (application crash) with a user crafted input file via an integer overflow during syntax parsing. This was addressed by fixing stack size detection on Linux in jsutils.c.