CVE-2026-84451 libheif: Incomplete fix for CVE-2026-62292 leaves libheif vulnerable to an out-of-bounds read

libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.3, the no-icef full-item branch of uncdecoder::getcompressedimagedatauncompressed in libheif/codecs/uncompressed/uncdecoder.cc retains an addition-based range check that can wrap when a crafted uncompressed tile gr...