ALPINE-CVE-2025-64506
Record from OSV · Published November 25, 2025
LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. From version 1.6.0 to before 1.6.51, a heap buffer over-read vulnerability exists in libpng's png_write_image_8bit function when processing 8-bit images through the simplified write API with convert_to_8bit enabled. The vulnerability affects 8-bit grayscale+alpha, RGB/RGBA, and images with incomplete row data. A conditional guard incorrectly allows 8-bit input to enter code expecting 16-bit input, causing reads up to 2 bytes beyond allocated buffer boundaries. This issue has been patched in version 1.6.51.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| libpng | Alpine:v3.22 | 1.6.51-r0 |
| libpng | Alpine:v3.24 | 1.6.51-r0 |
| libpng | Alpine:v3.20 | 1.6.53-r0 |
| libpng | Alpine:v3.21 | 1.6.53-r0 |
| libpng | Alpine:v3.23 | 1.6.51-r0 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Alpine:v3.22 | libpng | 1.6.0, 1.5.9-r0, 1.6.7-r0 |
| Alpine:v3.24 | libpng | 1.6.0 |
| Alpine:v3.20 | libpng | 1.2.35-r0, 1.2.36-r0, 1.2.37-r0 |
| Alpine:v3.21 | libpng | 1.6.0, 1.2.40-r0, 1.4.1-r0 |
| Alpine:v3.23 | libpng | 0, 1.2.35-r0, 1.2.36-r0 |
Timeline
- Nov 25, 2025 CVE Published
- Jul 8, 2026 CVE Updated
- Aug 8, 2026 Distribution Patch
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