High severity · published Nov 24, 2025
CVE-2025-64720
LIBPNG is vulnerable to a buffer overflow in `png_image_read_composite` via incorrect palette premultiplication
7.1
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 39% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libpng · pnggroup
>= 1.6.0, < 1.6.51 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-64720
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-64720
Patch
https://github.com/pnggroup/libpng/commit/08da33b4c88cfcd36e5a706558a8d7e0e4773643
Exploit
https://github.com/pnggroup/libpng/issues/686
Issue Tracking
https://github.com/pnggroup/libpng/pull/751
Exploit
https://github.com/pnggroup/libpng/security/advisories/GHSA-hfc7-ph9c-wcww
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