CVE-2025-64506

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. From version 1.6.0 to before 1.6.51, a heap buffer over-read vulnerability exists in libpng's png_write_image_8bit function when processing 8-bit images through the simplified write API with convert_to_8bit enabled. The vulnerability affects 8-bit grayscale+alpha, RGB/RGBA, and images with incomplete row data. A conditional guard incorrectly allows 8-bit input to enter code expecting 16-bit input, causing reads up to 2 bytes beyond allocated buffer boundaries. This issue has been patched in version 1.6.51.

Affected products

Alt Linux, Debian, Libpng, Linuxmint, Red Os, Ubuntu

Libpng

< 1.6.51

Fix

Available

CVSS 3.1

6.1 MEDIUM

EPSS

0.1% (4th percentile)

Weakness

CWE-125

NVD status

Analyzed

Published

2025-11-24