CVE-2025-64505: Libpng

Medium severity, CVSS 6.1. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Libpng Libpng: before 1.6.51 (fixed in 1.6.51)

Published 2025-11-25. Last modified 2026-06-17.