CVE-2026-25646 — LIBPNG has a heap buffer overflow in png_set_quantize

Description (CNA)

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 (CNA)

Vendor / product	Versions
pnggroup / libpng	affected < 1.6.55

CWE

CWE-122, CWE-126

References

ADP enrichment

CVE

No English description supplied.

http://www.openwall.com/lists/oss-security/2026/02/09/7

CISA-ADP

No English description supplied.

https://github.com/pnggroup/libpng/security/advisories/GHSA-g8hp-mq4h-rqm3

redhat-SADP

A heap based buffer overflow flaw has been discovered in LibPNG. Prior to version 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.