{"id":"AZL-94496","summary":"CVE-2026-19027 affecting package hdf5 1.14.6-4","details":"The H5Z__nbit_decompress_one_byte, H5Z__nbit_decompress_one_nooptype, and H5Z__nbit_decompress_one_atomic functions in H5Znbit.c in HDF5 through 2.3.0 advance a read index into the compressed chunk buffer without bounding it against the buffer's actual size. This allows attackers to cause an out-of-bounds heap read, and in constrained cases disclosure of adjacent heap memory into decompressed dataset values, via a crafted HDF5 file whose N-Bit filter parameters describe more decompressed data than the stored compressed chunk actually contains, triggered via H5Dread, e.g. by the h5ls or h5repack tools.","modified":"2026-08-31T05:26:27Z","published":"2026-08-06T00:16:53Z","upstream":["CVE-2026-19027"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-19027"}],"affected":[{"package":{"name":"hdf5","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/hdf5"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.14.6-4"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-94496.json"}}],"schema_version":"1.9.0"}