Heap Buffer Over-read Vulnerability in Libpng Affects Multiple Image Formats
CVE-2025-64506

6.1MEDIUM

Key Information:

Vendor

Pnggroup

Status
Libpng
Vendor
CVE Published:
24 November 2025

What is CVE-2025-64506?

Libpng, a library for processing PNG images, has a heap buffer over-read vulnerability in its png_write_image_8bit function when handling 8-bit images through the simplified write API with convert_to_8bit enabled. This vulnerability impacts images that are 8-bit grayscale with alpha channels, RGB/RGBA images, and those with incomplete row data. A flawed conditional guard allows 8-bit inputs to be processed by code designed for 16-bit inputs, leading to the potential reading of data from beyond allocated buffer boundaries. Users are recommended to update to version 1.6.51 or later to mitigate this risk.

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Affected Version(s)

libpng >= 1.6.0, < 1.6.51

References

https://github.com/pnggroup/libpng/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/pnggroup/libpng/pull/749
x_refsource_MISC
https://github.com/pnggroup/libpng/commit/2bd84c019c300b7...
x_refsource_MISC

CVSS V3.1

Score:
6.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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