CVE-2025-64720

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, an out-of-bounds read vulnerability exists in png_image_read_composite when processing palette images with PNG_FLAG_OPTIMIZE_ALPHA enabled. The palette compositing code in png_init_read_transformations incorrectly applies background compositing during premultiplication, violating the invariant component ≤ alpha × 257 required by the simplified PNG API. This issue has been patched in version 1.6.51.

Affected products

Alt Linux, Almalinux, Centos, Debian, Libpng, Linuxmint, Red Hat, Red Os

Libpng

< 1.6.51

Fix

Available

CVSS 3.1

7.1 HIGH

EPSS

0.4% (35th percentile)

Weakness

CWE-125

NVD status

Analyzed

Published

2025-11-24