CVE-2025-64720 – LIBPNG is vulnerable to a buffer overflow in `png_image_read_composite` via incorrect palette premultiplication

CVE ID : CVE-2025-64720

Published : Nov. 25, 2025, 12:15 a.m. | 1 hour, 7 minutes ago

Description : 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.

Severity: 7.1 | HIGH

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