CVE-2025-64505
MEDIUM6.1EPSS 0.01%libpng1.6 - security update
Published: 11/25/2025Modified: 4/28/2026
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.
Affected packages (4)
- Alpine/libpngfrom 0, < 1.6.53-r0
- Debian/libpng1.6from 0, < 1.6.37-3+deb11u1
- Debian/libpng1.6from 0, < 1.6.37-3+deb11u1
- Debian/libpng1.6from 0, < 1.6.39-2+deb12u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.1 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H |