ALPINE-CVE-2025-64720

ALPINE-CVE-2025-64720 PUBLISHED CVSS 7.099999904632568 HIGH

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.

Risk Scores

CVSS v3.1

7.099999904632568

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

Affected Products

Vendor	Product	Versions
Alpine:v3.23	libpng	1.5.5-r0, 1.5.4-r0, 1.5.2-r2
Alpine:v3.20	libpng	1.6.37-r0, 0, 1.2.34-r0
Alpine:v3.22	libpng	1.6.39-r1, 1.6.3-r0, 1.6.31-r0
Alpine:v3.21	libpng	1.6.9-r0, 1.6.8-r0, 1.6.7-r0

Timeline

Nov 25, 2025 CVE Published
Dec 8, 2025 CVE Updated
Apr 30, 2026 Distribution Patch

References

https://security.alpinelinux.org/vuln/CVE-2025-64720 advisory

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