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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Libpng | Libpng | >= 1.6.0, < 1.6.51 |
Related Weaknesses (CWE)
References
- https://github.com/pnggroup/libpng/commit/2bd84c019c300b78e811743fbcddb67c9d9bf8Patch
- https://github.com/pnggroup/libpng/pull/749Issue Tracking
- https://github.com/pnggroup/libpng/security/advisories/GHSA-qpr4-xm66-hww6Vendor Advisory
FAQ
What is CVE-2025-64506?
CVE-2025-64506 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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...
How severe is CVE-2025-64506?
CVE-2025-64506 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-64506?
Check the references section above for vendor advisories and patch information. Affected products include: Libpng Libpng.