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CVE-2025-64720

HighPublished

LIBPNG is vulnerable to a buffer overflow in png_image_read_composite via incorrect palette premultiplication

Published: Nov 24, 2025
Updated: Nov 25, 2025
Assigning CNA: GitHub_M
Evidence observed: Aug 6, 2026

Primary CVSS

7.1/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 35.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2025-64720-PoCPoC
Proof-of-concept exploit for CVE-2025-64720, a libpng buffer overflow in palette premultiplication. Includes exploit generator, test harness with ASan/UBSan, and detailed technical analysis of the heap-use-after-free vulnerability.

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