Description
LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to version 1.6.51, a heap buffer over-read vulnerability exists in libpng's png_do_quantize function when processing PNG files with malformed palette indices. The vulnerability occurs when palette_lookup array bounds are not validated against externally-supplied image data, allowing an attacker to craft a PNG file with out-of-range palette indices that trigger out-of-bounds memory access. 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-4952-h5wq-4m42
Issue Tracking x_refsource_misc
https://github.com/pnggroup/libpng/pull/748
Scores
CVSS v3
6.1
EPSS
0.0001
EPSS Percentile
1.5%
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
< 1.6.51
Published
Nov 25, 2025
Tracked Since
Feb 18, 2026