An issue was discovered in HDF5 through 1.12.0. A NULL pointer dereference exists in the function H5AC_unpin_entry() located in H5AC.c. It allows an attacker to cause Denial of Service.
https://research.loginsoft.com/bugs/null-pointer-dereference-in-h5ac-c-hdf5-1-13-0/
https://github.com/Loginsoft-Research/hdf5-reports/tree/master/Vuln_3
https://bitbucket.hdfgroup.org/projects/HDFFV/repos/hdf5/browse/release_docs/RELEASE.txt