CVE-2025-64506CWE-125

CVE-2025-64506

Medium · published November 25, 2025

CVSS v3.1
6.1
EPSS
0%
Percentile
3.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00140 · 3.0th percentile
Weakness
CWE-125 · Out-of-bounds Read
Published
2025-11-25T05:15Z
Affected products (1)
ProductVersionsFixed in
libpng/libpng≥ 1.6.0, < 1.6.511.6.51
References (3)
https://github.com/pnggroup/libpng/commit/2bd84c019c300b78e811743fbcddb67c9d9bf821 · [email protected]https://github.com/pnggroup/libpng/pull/749 · [email protected]https://github.com/pnggroup/libpng/security/advisories/GHSA-qpr4-xm66-hww6 · [email protected]
EPSS history
Timeline
  • 24 NOV 23:41Z
    LIBPNG is vulnerable to a heap buffer over-read in `png_write_image_8bit` with grayscale+alpha or RGB/RGBA images
    cvelistv5