LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to version 1.6.51, a heap buffer over-read vulnerability exists in libpng's png_do_quantize function when processing PNG files with malformed palette indices. The vulnerability occurs when palette_lookup array bounds are not validated against externally-supplied image data, allowing an attacker to craft a PNG file with out-of-range palette indices that trigger out-of-bounds memory access. This issue has been patched in version 1.6.51.
Exploitability
AV:LAC:LPR:NUI:RScope
S:UImpact
C:LI:NA:H6.1/CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:HMemory Safety