LibRaw 0.21.3 Release is just published in our Github repository and this site download section.

Changes are:

• new compile-time define LIBRAW_CALLOC_RAWSTORE
  If defined: calloc() will be used for all big buffer allocations to prevent uninitialized heap data leak
• Small allocations: calloc() instead of malloc() to prevent uninitialized heap data leak
• Support for 4-component JPEG-compressed DNG files
• CR3-Qstep table: avoid wrong 64-bit code generation
• Fixed several bugs related to specially-crafted files processing (thanks to OSS-Fuzz project)