CVE-2025-66293highCWE-125

CVE-2025-66293: high-severity vulnerability in pnggroup libpng

LIBPNG has an out-of-bounds read in png_image_read_composite

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21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.1epss 0.4%
LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to 1.6.52, an out-of-bounds read vulnerability in libpng's simplified API allows reading up to 1012 bytes beyond the png_sRGB_base[512] array when processing valid palette PNG images with partial transparency and gamma correction. The PNG files that trigger this vulnerability are valid per the PNG specification; the bug is in libpng's internal state management. Upgrade to libpng 1.6.52 or later.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Affected products
pnggroup · libpng
Related CVEs — pnggroup libpng

In the same product, most dangerous first.

CVE-2026-25646HIGHLIBPNG has a heap buffer overflow in png_set_quantizeEPSS 1.1%CVE-2026-33416HIGHLIBPNG has use-after-free via pointer aliasing in `png_set_tRNS` and `png_set_PLTE`EPSS 1.1%CVE-2026-33636HIGHLIBPNG has ARM NEON Palette Expansion Out-of-Bounds Read on AArch64EPSS 0.8%CVE-2025-64720HIGHLIBPNG is vulnerable to a buffer overflow in `png_image_read_composite` via incorrect palette premultiplicationEPSS 0.4%CVE-2025-65018HIGHLIBPNG is vulnerable to a heap buffer overflow in `png_combine_row` triggered via `png_image_finish_read`EPSS 0.3%CVE-2026-22695MEDIUMLIBPNG has a heap buffer over-read in png_image_read_direct_scaled (regression from CVE-2025-65018 fix)EPSS 0.2%