CVE-2025-64506: Libpng

Medium severity, CVSS 6.1. EPSS: 0.1% 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, 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

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

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