CVE-2025-64720-PoC

CVE-2025-64720：libpng 调色板预乘中的缓冲区溢出 状态 ：已修复 严重性 ：高 CVE 标识符 ：CVE-2025-64720 发现日期 ：2025-11-XX 公开披露日期 ：2025-11-21 概述 摘要 在 libpng 的 pngimagereadcomposite 函数中，当处理启用了 PNGFLAGOPTIMIZEALPHA 的调色板图像时，存在一个越界读取漏洞。pnginitreadtransformations 中的调色板合成代码在预乘过程中错误地应用了背景合成，违反了简化 PNG API 所要求的不变性 component ≤ alpha ×...

libpng: LIBPNG buffer overflow

A buffer overflow flaw has been discovered in libpng. An out-of-bounds read vulnerability exists in pngimagereadcomposite when processing palette images with PNGFLAGOPTIMIZEALPHA enabled. The palette compositing code in pnginitreadtransformations incorrectly applies background compositing during...

EUVD-2025-199237

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 pngimagereadcomposite when processing palette images with PNGFLAGOPTIMIZEALP...

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

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 pngimagereadcomposite when processing palette images with PNGFLAGOPTIMIZEALP...