Vulnerability details

CVE-2025-64720

pnggroup libpng

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

CVSS 3.1

7.1High

Official 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 scores

Score	Version	Source	Vector
7.1High	3.1	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H`

Affected products

Vendor	Product	Versions	Source
pnggroup	libpng	>= 1.6.0, < 1.6.51	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/pnggroup/libpng/issues/686 x_refsource_MISC
https://github.com/pnggroup/libpng/pull/751 x_refsource_MISC
https://github.com/pnggroup/libpng/commit/08da33b4c88cfcd36e5a706558a8d7e0e4773643 x_refsource_MISC
https://github.com/pnggroup/libpng/security/advisories/GHSA-hfc7-ph9c-wcww x_refsource_CONFIRM

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Details

Published: 2025-11-25
Last updated: 2025-11-25
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.44%

Probability of exploitation in 30 days

39%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: Proof of concept
Technical impact: Partial

Weaknesses (CWE)

CWE-125
Out-of-bounds Read