High 7.1Published Nov 24, 2025

CVE-2025-64720LIBPNG is vulnerable to a buffer overflow in `png_image_read_composite` via incorrect palette premultiplication

Updated under an hour ago (Oct 26, 2026, 2:10 AM ET)

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Every CVE for pnggroup libpng

Exploited in the last 30 days

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.

CVSS: 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Weakness (CWE): CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Nov 25, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

pnggroup libpng pnggroup:libpng (from the name)	from 1.6.0, < 1.6.51	CNA record
libpng libpng libpng:libpng	from 1.6.0 before 1.6.51	NVD

References

https://github.com/pnggroup/libpng/security/advisories/GHSA-hfc7-ph9c-wcwwx-refsource-confirm, exploit, vendor-advisory
https://github.com/pnggroup/libpng/issues/686x-refsource-misc, exploit, issue-tracking
https://github.com/pnggroup/libpng/pull/751x-refsource-misc, issue-tracking, patch
https://github.com/pnggroup/libpng/commit/08da33b4c88cfcd36e5a706558a8d7e0e4773643x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.