CVE-2025-48172

CHMLib through 2bef8d0, as used in SumatraPDF and other products, has a chm_lib.c _chm_decompress_block integer overflow. There is a resultant heap-based buffer overflow in _chm_fetch_bytes.

More information : https://drive.google.com/file/d/1XpulFyCGlq7Szzg5RsH-eRwZ6OyuSozl/view?usp=sharing