CVE-2025-64506 — LIBPNG is vulnerable to a heap buffer over-read in `png_write_image_8bit` with grayscale+alpha or RGB/RGBA images

Affected: pnggroup libpng

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.

USN-7924-1 — libpng1.6 vulnerabilities

Affected: Ubuntu:Pro:16.04:LTS: libpng1.6, Ubuntu:Pro:18.04:LTS: libpng1.6, Ubuntu:Pro:20.04:LTS: libpng1.6, Ubuntu:22.04:LTS: libpng1.6, Ubuntu:24.04:LTS: libpng1.6, Ubuntu:25.10: libpng1.6

It was discovered that libpng incorrectly handled memory when processing certain PNG files, which could result in an out-of-bounds memory access. If a user or automated system were tricked into opening a specially crafted PNG file, an attacker could use this issue to cause libpng to crash, resulting in a denial of service. (CVE-2025-64505)

It was discovered that libpng incorrectly handled memory when processing 8-bit images through the simplified write API with 'convert_to_8bit' enabled, which could result in an out-of-bounds memory access. If a user or automated system were tricked into opening a specially crafted 8-bit PNG file, an attacker could use this issue to cause libpng to crash, resulting in a denial of service. (CVE-2025-64506)

It was discovered that libpng incorrectly handled memory when processing palette images with 'PNG_FLAG_OPTIMIZE_ALPHA' enabled, which could result in an out-of-bounds memory access. If a user or automated system were tricked into opening a specially crafted PNG file, an attacker could use this issue to cause libpng to crash, resulting in a denial of service. (CVE-2025-64720)

It was discovered that libpng incorrectly handled memory when processing 6-bit interlaced PNGs with 8-bit output format, which could result in an out-of-bounds memory access. If a user or automated system were tricked into opening a specially crafted PNG file, an attacker could use this issue to cause libpng to crash, resulting in a denial of service. (CVE-2025-65018)

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CVE-2025-64506 — LIBPNG is vulnerable to a heap buffer over-read in `png_write_image_8bit` with grayscale+alpha or RGB/RGBA images

USN-7924-1 — libpng1.6 vulnerabilities