CVE-2025-64720

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.

CVSS Metrics

• v3.1•HIGH•Score: 7.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

EPSS Trends

Current EPSS score: 0.10%• Percentile: 28%

Techniques & Countermeasures

• CWE-125•Out-of-bounds Read

  The product reads data past the end, or before the beginning, of the intended buffer.

Affected Systems

• libpng•libpng

  ≥ 1.6.0, < 1.6.51

• pnggroup•libpng

  ≥ 1.6.0, < 1.6.51

References (4)

• https://github.com/pnggroup/libpng/security/advisories/GHSA-hfc7-ph9c-wcww
• https://github.com/pnggroup/libpng/issues/686
• https://github.com/pnggroup/libpng/pull/751
• https://github.com/pnggroup/libpng/commit/08da33b4c88cfcd36e5a706558a8d7e0e4773643