CVE-2026-22801

LIBPNG has an integer truncation causing heap buffer over-read in png_image_write_*

State: Published
Severity: 6.8 Medium
Published: Jan 12, 2026
Updated: Jan 13, 2026
Reserved: Jan 9, 2026

Description

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. From 1.6.26 to 1.6.53, there is an integer truncation in the libpng simplified write API functions png_write_image_16bit and png_write_image_8bit causes heap buffer over-read when the caller provides a negative row stride (for bottom-up image layouts) or a stride exceeding 65535 bytes. The bug was introduced in libpng 1.6.26 (October 2016) by casts added to silence compiler warnings on 16-bit systems. This vulnerability is fixed in 1.6.54.

Scores

CVSS	Score	Vector	Source
3.1	6.8 Medium	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H	GitHub_M

Weaknesses

CWE-125 Out-of-bounds Read
CWE-190 Integer Overflow or Wraparound

Affected Products

Product	Versions
libpngpnggroup	< 1.6.54Affected

References

https://github.com/pnggroup/libpng/security/advisories/GHSA-vgjq-8cw5-ggw8

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