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.

• CWE-125

• https://github.com/pnggroup/libpng/commit/08da33b4c88cfcd36e5a706558a8d7e0e4773643Patch
• https://github.com/pnggroup/libpng/issues/686Exploit, Issue Tracking
• https://github.com/pnggroup/libpng/pull/751Issue Tracking, Patch
• https://github.com/pnggroup/libpng/security/advisories/GHSA-hfc7-ph9c-wcwwExploit, Vendor Advisory
• https://github.com/pnggroup/libpng/security/advisories/GHSA-hfc7-ph9c-wcwwExploit, Vendor Advisory

Published

Nov 25, 2025

Last Modified

Jun 17, 2026

Status

Analyzed

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