Buffer underflow in `H5Iget_name `/`H5G_get_name` if size is zero

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CVE-2026-26199 Buffer underflow in `H5Iget_name `/`H5G_get_name` if size is zero

HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If H5Igetname is invoked on a group id with 0 for the size parameter, it will underflow when trying to place a null terminator in the buffer. This can occur if H5Igetname is invoked in a way...

CVE-2026-26199

The CVE-2026-26199 entry describes a buffer underflow in HDF5 when calling H5Iget_name (and H5G_get_name) with a size of zero. Under conditions where an ID is queried with size forced to zero and there is significant data before the name buffer, the function may fail to place a null terminator, l...