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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-64506
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-11-25 00:15:47 UTC
Updated2026-10-18 20:10:00 UTC
DescriptionLIBPNG 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.

Risk And Classification

Primary CVSS: v3.1 6.1 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

EPSS: 0.001400000 probability, percentile 0.029970000 (date 2026-10-18)

Problem Types: CWE-125 | CWE-125 CWE-125: Out-of-bounds Read

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.1MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
3.1CNADECLARED6.1MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Libpng Libpng All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Pnggroup Libpng affected >= 1.6.0, < 1.6.51 Not specified

References

ReferenceSourceLinkTags
github.com/pnggroup/libpng/security/advisories/GHSA-qpr4-xm66-hww6 [email protected] github.com Vendor Advisory
github.com/pnggroup/libpng/commit/2bd84c019c300b78e811743fbcddb67c9d9bf821 [email protected] github.com Patch
github.com/pnggroup/libpng/pull/749 [email protected] github.com Issue Tracking
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