Multiple heap-based buffer overflow vulnerabilities exist in the fstReaderIterBlocks2 chaintable parsing functionality of GTKWave 3.3.115. A specially crafted .fst file can lead to arbitrary code execution. A victim would need to open a malicious file to trigger these vulnerabilities.This vulnerability concerns the chaintable of FST_BL_VCDATA
and FST_BL_VCDATA_DYN_ALIAS
section types.