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HIGH

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

Published Nov 24, 2025

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.

Affected products

Remediation

Red Hat statement

This vulnerability is rated Important for Red Hat products. An out-of-bounds read in libpng can occur when processing specially crafted palette images with `PNG_FLAG_OPTIMIZE_ALPHA` enabled. Successful exploitation requires a user to process a malicious PNG file, leading to potential application crash or information disclosure. java-*-openjdk-headless packages do not contain libsplashscreen.so, hence are not affected.

Red Hat mitigation

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Weaknesses (1)

CWE-125

Out-of-bounds Read

References (8)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner GitHub_M
Published Nov 24, 2025
Updated Nov 25, 2025
Reserved Nov 10, 2025
Link CVE-2025-64720
CISA Vulnrichment
Updated Nov 25, 2025
NVD
Status Analyzed
Modified Jun 17, 2026
Link CVE-2025-64720
Red Hat
Severity Important
Public date Nov 24, 2025
Links CVE-2025-64720 - Bugzilla