CVE-2026-25646

Summary

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to 1.6.55, an out-of-bounds read vulnerability exists in the png_set_quantize() API function. When the function is called with no histogram and the number of colors in the palette is more than twice the maximum supported by the user's display, certain palettes will cause the function to enter into an infinite loop that reads past the end of an internal heap-allocated buffer. The images that trigger this vulnerability are valid per the PNG specification. This vulnerability is fixed in 1.6.55.

Affected Software

VendorProductVersion RangeStatus
pnggrouplibpng< 1.6.55affected

Weaknesses

  • CWE-122: CWE-122: Heap-based Buffer Overflow
  • CWE-126: CWE-126: Buffer Over-read

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: no
    • Technical Impact: partial

Additional References

libpng: LIBPNG has a heap buffer overflow in png_set_quantize

Additional References

References