CVE-2026-19025 HDF5 divide-by-zero (SIGFPE) via mismatched chunk-layout dimensionality and dataspace rank on dataset open

H5Olayoutdecode in H5Olayout.c in HDF5 through 2.3.0 does not validate that a chunked dataset's stored chunk-layout dimensionality matches its dataspace rank when an existing dataset is opened, whereas this check is performed only at dataset-creation time. This allows attackers to cause a denial ...

CVE-2026-19025

The CVE-2026-19025 entry concerns HDF5 versions up to 2.3.0. It describes a flaw in H5O__layout_decode within H5Olayout.c where a chunked dataset’s stored chunk-layout dimensionality is not validated against its dataspace rank when an existing dataset is opened (validation exists only at dataset ...