Vulnerability record · CVE-2025-64720 · published 25 November 2025

CVE-2025-64720: Libpng out-of-bounds read vulnerability

LLibpng · Libpng

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.

7.1 CVSS 3.1 High EPSS 0.42% · top 66.6% CWE-125 · Out-of-bounds read

7.1CVSS 3.1 base score

0.42%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

5References, 3 tagged exploit

17 Jun 2026Last modified by NVD

Description

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

LLibpng Libpng

References

Link	Tags
https://github.com/pnggroup/libpng/commit/08da33b4c88cfcd36e5a706558a8d7e0e4773643	Patch
https://github.com/pnggroup/libpng/issues/686	ExploitIssue Tracking
https://github.com/pnggroup/libpng/pull/751	Issue TrackingPatch
https://github.com/pnggroup/libpng/security/advisories/GHSA-hfc7-ph9c-wcww	ExploitVendor Advisory
https://github.com/pnggroup/libpng/security/advisories/GHSA-hfc7-ph9c-wcww	ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-64720), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.