CVE-2026-84449Low· 3.7▾ TwilightPoC availablelibheif 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_…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 20.4 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 19.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.3%
Last analysed / modified upstream
Exploit / PoC code exists
0.3% → 0.4%
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.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-84383Critical· 9.8libheif is a HEIF and AVIF file format decoder and encoder
CVE-2025-68431Medium· 6.5libheif is an HEIF and AVIF file format decoder and encoder
CVE-2026-84448Medium· 4.0libheif is a HEIF and AVIF file format decoder and encoder
CVE-2026-84451Medium· 6.5libheif is a HEIF and AVIF file format decoder and encoder
CVE-2026-84444High· 7.4libheif is a HEIF and AVIF file format decoder and encoder
CVE-2026-84447High· 7.5libheif is a HEIF and AVIF file format decoder and encoder