CVE-2025-64505: medium-severity vulnerability in pnggroup libpng
LIBPNG is vulnerable to a heap buffer overflow in `png_do_quantize` via malformed palette index
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.1epss 0.2%
LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to version 1.6.51, a heap buffer over-read vulnerability exists in libpng's png_do_quantize function when processing PNG files with malformed palette indices. The vulnerability occurs when palette_lookup array bounds are not validated against externally-supplied image data, allowing an attacker to craft a PNG file with out-of-range palette indices that trigger out-of-bounds memory access. This issue has been patched in version 1.6.51.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Affected products
pnggroup · libpngRelated 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-2025-66293HIGHLIBPNG has an out-of-bounds read in png_image_read_compositeEPSS 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%