CVE-2026-84449

libheif hOp_RGB24_32_to_YCbCr Memory Access Error / SEGV

State: Published
Severity: 3.7 Low
Published: Sep 18, 2026
Updated: Sep 22, 2026
Reserved: Sep 1, 2026

Description

libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.19.6, Op_RGB24_32_to_YCbCr::convert_colorspace() stores image-plane strides in an integer width that can overflow for extremely large RGB images created through heif_image_create() and heif_image_add_plane(). The resulting wrapped stride causes the conversion loop in libheif/color-conversion/rgb2yuv.cc to compute an invalid input pointer and read beyond the allocated interleaved plane while heif_context_encode_image() performs RGB-to-YCbCr conversion. This can crash the encoding process. This issue is fixed in version 1.19.6.

Scores

CVSS	Score	Vector	Source
3.1	3.7 Low	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L	GitHub_M

Weaknesses

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

Affected Products

Product	Versions
libheifstrukturag	< 1.19.6Affected

References

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