In radare2 prior to 3.1.1, the parseOperand function inside libr/asm/p/asm_x86_nz.c may allow attackers to cause a denial of service (application crash via a stack-based buffer overflow) by crafting an input file, a related issue to CVE-2018-20456.
https://github.com/radare/radare2/issues/12373
https://github.com/radare/radare2/commit/9b46d38dd3c4de6048a488b655c7319f845af185