Description
LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.6.36 through 1.6.55, an out-of-bounds read and write exists in libpng's ARM/AArch64 Neon-optimized palette expansion path. When expanding 8-bit paletted rows to RGB or RGBA, the Neon loop processes a final partial chunk without verifying that enough input pixels remain. Because the implementation works backward from the end of the row, the final iteration dereferences pointers before the start of the row buffer (OOB read) and writes expanded pixel data to the same underflowed positions (OOB write). This is reachable via normal decoding of attacker-controlled PNG input if Neon is enabled. Version 1.6.56 fixes the issue.
INFO
Published Date :
2026-03-26T16:51:58.289Z
Last Modified :
2026-03-26T18:45:26.631Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-33636 vulnerability.
| Vendors | Products |
|---|---|
| Pnggroup |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-33636.
