CVE-2026-84449: Strukturag Libheif

Low severity, CVSS 3.7. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Strukturag Libheif: before 1.19.6 (fixed in 1.19.6)

Published 2026-09-18. Last modified 2026-09-22.