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, a heap buffer over-read vulnerability exists in libpng's png_write_image_8bit function when processing 8-bit images through the simplified write API with convert_to_8bit enabled. The vulnerability affects 8-bit grayscale+alpha, RGB/RGBA, and images with incomplete row data. A conditional guard incorrectly allows 8-bit input to enter code expecting 16-bit input, causing reads up to 2 bytes beyond allocated buffer boundaries. This issue has been patched in version 1.6.51.
References (3)
Core 3
Core References
Vendor Advisory x_refsource_confirm
https://github.com/pnggroup/libpng/security/advisories/GHSA-qpr4-xm66-hww6
Issue Tracking x_refsource_misc
https://github.com/pnggroup/libpng/pull/749
Scores
CVSS v3
6.1
EPSS
0.0002
EPSS Percentile
4.4%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-125
Status
published
Products (1)
libpng/libpng
1.6.0 - 1.6.51
Published
Nov 25, 2025
Tracked Since
Feb 18, 2026