CVE-2023-35956: Tonybybell Gtkwave

High severity, CVSS 7.8. EPSS: 0.4% chance of exploitation in the next 30 days.

Multiple heap-based buffer overflow vulnerabilities exist in the fstReaderIterBlocks2 VCDATA 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 decompression function `fastlz_decompress`.

Affected products

• Tonybybell Gtkwave: version 3.3.115 only

Published 2024-01-08. Last modified 2026-06-17.