A vulnerability in the hdf5 library causes an UNKNOWN READ crash in the function H5FL__blk_gc_list, as reported by OSS-Fuzz. The crash occurs during garbage collection routines in the library. This issue affects specific versions of hdf5 including 2.0.0 through 2.2.0. No patch or official fix information is provided in the available data. There are no known exploits in the wild for this vulnerability.