# CVE-2025-64506

## Summary

- **CVE ID:** CVE-2025-64506
- **Severity:** MEDIUM
- **CVSS Score:** 6.1 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H)
- **CWE:** CWE-125
- **Published:** Nov 24, 2025
- **Last Modified:** Sep 14, 2026

## Description

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.

## Affected Products

- pnggroup — libpng (>= 1.6.0, < 1.6.51)

## References

- [CNA](https://github.com/pnggroup/libpng/security/advisories/GHSA-qpr4-xm66-hww6)
- [CNA](https://github.com/pnggroup/libpng/pull/749)
- [CNA](https://github.com/pnggroup/libpng/commit/2bd84c019c300b78e811743fbcddb67c9d9bf821)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.14%
- **EPSS Percentile:** 3.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._