Build 3.0.0.120 of xlsgen has a fix related to the ZIP library, used internally by xlsgen to load and save XLSX files.

The ZIP library has been updated by their maintainers (open source project) for security reasons and improvements. zlib 1.2.8 is now used instead of zlib 1.2.3

No source code changed needed.

Build 3.0.0.119 of xlsgen has a security fix related to the PNG library which is used by xlsgen.

The PNG (Portable Network Graphics) library is what loads and saves PNG pictures. PNG is a first class citizen in xlsgen. You can export pictures as PNG, charts as PNG and even sheets as PNG.

The PNG library (open source project) got updated since last year with security fixes, and that is the reason why we are upgrading xlsgen as well. Specifically we are moving from libpng 1.2.35 to libpng 1.2.50

No source code change needed.