In HDF5 1.10.1, there is an out of bounds read vulnerability in the function H5T_conv_struct_opt in H5Tconv.c in libhdf5.a. For example, h5dump would crash when someone opens a crafted hdf5 file.
CWE-125 - Out-of-Bounds Read
Out-of-bounds read is a vulnerability that allows access to memory beyond the authorized accessible location. Such a vulnerability compromises the confidentiality of the trusted environment in the application and enables an attacker to launch further attacks by leveraging the exposed information.