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.
History

Wed, 23 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sat, 19 Sep 2026 22:30:00 +0000

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First Time appeared Struktur
Struktur libheif
Vendors & Products Struktur
Struktur libheif

Fri, 18 Sep 2026 16:15:00 +0000

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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.
Title libheif hOp_RGB24_32_to_YCbCr Memory Access Error / SEGV
Weaknesses CWE-125
CWE-190
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-09-18T16:03:28.532Z

Updated: 2026-09-22T14:52:30.772Z

Reserved: 2026-09-01T20:05:09.423Z

Link: CVE-2026-84449

cve-icon Vulnrichment

Updated: 2026-09-22T14:52:25.351Z

cve-icon NVD

Status : Deferred

Published: 2026-09-18T16:17:12.997

Modified: 2026-09-22T15:17:19.207

Link: CVE-2026-84449

cve-icon Redhat

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