CVE-2019-20334: Uncontrolled Recursion

In Netwide Assembler NASM 2.14.02, stack consumption occurs in expr functions in asm/eval.c. This potentially affects the relationships among expr0, expr1, expr2, expr3, expr4, expr5, and expr6 and stdscan in asm/stdscan.c. This is similar to CVE-2019-6290 and CVE-2019-6291...