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.
Fix
Public exploits 1
- dantsco/CVE-2025-64720-PoC PoC on GitHub
Each line links to the index that lists it, never to exploit code. Exploit-DB's "verified" and a Metasploit rank of good or better count as verified; a PoC-in-GitHub entry is a repository's claim.
Patch, vendor advisory and mitigation references on NVD 4
- https://github.com/pnggroup/libpng/commit/08da33b4c88cfcd36e5a706558a8d7e0e4773643 Patch
- https://github.com/pnggroup/libpng/pull/751 Issue Tracking, Patch
- https://github.com/pnggroup/libpng/security/advisories/GHSA-hfc7-ph9c-wcww Exploit, Vendor Advisory
- https://github.com/pnggroup/libpng/security/advisories/GHSA-hfc7-ph9c-wcww Exploit, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.1 · libpngNVD modified 2026-10-18 20:10
Affected (CPE criteria) 1
cpe:2.3:a:libpng:libpng:*:*:*:*:*:*:*:*
References 5
- https://github.com/pnggroup/libpng/commit/08da33b4c88cfcd36e5a706558a8d7e0e4773643 Patch
- https://github.com/pnggroup/libpng/issues/686 Exploit, Issue Tracking
- https://github.com/pnggroup/libpng/pull/751 Issue Tracking, Patch
- https://github.com/pnggroup/libpng/security/advisories/GHSA-hfc7-ph9c-wcww Exploit, Vendor Advisory
- https://github.com/pnggroup/libpng/security/advisories/GHSA-hfc7-ph9c-wcww Exploit, Vendor Advisory