CVE-2025-64506

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.

How to fix CVE-2025-64506

To remediate CVE-2025-64506, upgrade the affected package to a fixed version below.

• —upgrade to 1.6.53-r0 or later
• —upgrade to 1.6.37-3+deb11u1 or later

Is CVE-2025-64506 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 1.6.53-r0
• from 0, < 1.6.37-3+deb11u1

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2025-64506
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2025-64506