EUVD-2026-20897CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
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Description
LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. From 1.0.9 to before 1.6.57, passing a pointer obtained from png_get_PLTE, png_get_tRNS, or png_get_hIST back into the corresponding setter on the same png_struct/png_info pair causes the setter to read from freed memory and copy its contents into the replacement buffer. The setter frees the internal buffer before copying from the caller-supplied pointer, which now dangles. The freed region may contain stale data (producing silently corrupted chunk metadata) or data from subsequent heap allocations (leaking unrelated heap contents into the chunk struct). This vulnerability is fixed in 1.6.57.
Analysis
Use-after-free in libpng 1.0.9 through 1.6.56 allows local attackers to leak heap memory and corrupt PNG chunk metadata by passing a pointer from png_get_PLTE, png_get_tRNS, or png_get_hIST directly into the corresponding setter function on the same structure, exploiting a freed buffer dereference. The vulnerability enables information disclosure and silent data corruption with low attack complexity and no user interaction required; fixed in version 1.6.57.
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