CVE-2025-64506— LIBPNG is vulnerable to a heap buffer over-read in `png_write_image_8bit` with grayscale+alpha or RGB/RGBA images
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I. Basic Information for CVE-2025-64506
Vulnerability Information
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Vulnerability Title
LIBPNG is vulnerable to a heap buffer over-read in `png_write_image_8bit` with grayscale+alpha or RGB/RGBA images
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存读
Source: NVD (National Vulnerability Database)
Vulnerability Title
libpng 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libpng是The PNG Development Group开源的一个可对PNG图形文件实现创建、读写等操作的PNG参考库。 libpng 1.6.0版本至1.6.51之前版本存在缓冲区错误漏洞，该漏洞源于png_write_image_8bit函数处理8位图像时存在堆缓冲区越界读取，可能导致越界内存访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-64506
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Same Patch Batch · pnggroup · 2025-11-24 · 4 CVEs total
| CVE-2025-64720 | 7.1 HIGH | LIBPNG is vulnerable to a buffer overflow in `png_image_read_composite` via incorrect pale |
| CVE-2025-65018 | 7.1 HIGH | LIBPNG is vulnerable to a heap buffer overflow in `png_combine_row` triggered via `png_ima |
| CVE-2025-64505 | 6.1 MEDIUM | LIBPNG is vulnerable to a heap buffer overflow in `png_do_quantize` via malformed palette |
IV. Related Vulnerabilities
Same product: libpng
- CVE-2026-34757
LIBPNG has a yse-after-free in png_set_PLTE, png_set_tRNS an - CVE-2026-33636
LIBPNG has ARM NEON Palette Expansion Out-of-Bounds Read on - CVE-2026-33416
LIBPNG has use-after-free via pointer aliasing in `png_set_t - CVE-2026-3713
pnggroup libpng pnm2png pnm2png.c do_pnm2png heap-based over - CVE-2026-25646
LIBPNG has a heap buffer overflow in png_set_quantize
Same vendor: pnggroup
- CVE-2026-34757
LIBPNG has a yse-after-free in png_set_PLTE, png_set_tRNS an - CVE-2026-33636
LIBPNG has ARM NEON Palette Expansion Out-of-Bounds Read on - CVE-2026-33416
LIBPNG has use-after-free via pointer aliasing in `png_set_t - CVE-2026-3713
pnggroup libpng pnm2png pnm2png.c do_pnm2png heap-based over - CVE-2026-25646
LIBPNG has a heap buffer overflow in png_set_quantize
Same weakness: CWE-125
- CVE-2026-8177
XML::LibXML versions through 2.0210 for Perl read out-of-bou - CVE-2026-6104
Global buffer over-read in mb_convert_encoding() with attack - CVE-2026-7258
Out-of-bounds read in urldecode() on NetBSD - CVE-2026-8186
Open5GS NF client.c ogs_sbi_client_send_via_scp_or_sepp out- - CVE-2026-3508
ASUS System Control Interface 缓冲区错误漏洞
V. Comments for CVE-2025-64506
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