CVE-2026-55586 | SumatraPDF Reader up to 3.6.1 CHMLib ext/CHMLib/lzx.c make_decode_table memory corruption

August 20, 2026 Yanac

A vulnerability was found in SumatraPDF Reader SumatraPDF up to 3.6.1. It has been classified as problematic. Impacted is the function make_decode_table of the file ext/CHMLib/lzx.c of the component CHMLib. Performing a manipulation results in memory corruption.

This vulnerability was named CVE-2026-55586. The attack needs to be approached locally. There is no available exploit.VulDB Recent EntriesRead More