CVE-2025-64720

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, an out-of-bounds read vulnerability exists in png_image_read_composite when processing palette images with PNG_FLAG_OPTIMIZE_ALPHA enabled. The palette compositing code in png_init_read_transformations incorrectly applies background compositing during premultiplication, violating the invariant component ≤ alpha × 257 required by the simplified PNG API. This issue has been patched in version 1.6.51.

How to fix CVE-2025-64720

To remediate CVE-2025-64720, 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-2025-64720 being exploited?

Low — EPSS is 0.1%, 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-2025-64720
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2025-64720