CVE-2025-64720: Libpng

High severity, CVSS 7.1. EPSS: 0.4% 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. 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

• Libpng Libpng: from 1.6.0, before 1.6.51 (fixed in 1.6.51)

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