{"id":"UBUNTU-CVE-2026-19026","details":"H5Z__filter_nbit in H5Znbit.c in HDF5 through 2.3.0 dereferences cd_values[0] through cd_values[4] without validating that cd_values is non-NULL or that cd_nelmts is at least 5, the fixed size of the filter's header. This allows attackers to cause a denial of service via a crafted HDF5 file that stores the N-Bit filter pipeline message with zero client-data values, opened and read via H5Dread, e.g. by the h5ls or h5repack tools.","modified":"2026-08-13T00:02:19Z","published":"2026-08-05T23:16:00Z","upstream":["CVE-2026-19026"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-19026"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-19026"},{"type":"REPORT","url":"https://github.com/HDFGroup/hdf5/pull/6497"},{"type":"REPORT","url":"https://github.com/HDFGroup/hdf5/issues/6489"},{"type":"REPORT","url":"https://github.com/HDFGroup/hdf5/issues/6492"}],"affected":[{"package":{"name":"hdf5","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/hdf5?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.11-3ubuntu1","1.8.11-5ubuntu1","1.8.11-5ubuntu2","1.8.11-5ubuntu6","1.8.11-5ubuntu7","1.8.11-5ubuntu7.1","1.8.11-5ubuntu7.1+esm1","1.8.11-5ubuntu7.1+esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"hdf5-helpers","binary_version":"1.8.11-5ubuntu7.1+esm2"},{"binary_name":"hdf5-tools","binary_version":"1.8.11-5ubuntu7.1+esm2"},{"binary_name":"libhdf5-7","binary_version":"1.8.11-5ubuntu7.1+esm2"},{"binary_name":"libhdf5-mpich2-7","binary_version":"1.8.11-5ubuntu7.1+esm2"},{"binary_name":"libhdf5-openmpi-7","binary_version":"1.8.11-5ubuntu7.1+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19026.json"}},{"package":{"name":"hdf5","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/hdf5?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.15-patch1+docs-4","1.8.15-patch1+docs-5","1.8.16+docs-1","1.8.16+docs-2","1.8.16+docs-3","1.8.16+docs-3ubuntu1","1.8.16+docs-4","1.8.16+docs-4ubuntu1","1.8.16+docs-4ubuntu1.1","1.8.16+docs-4ubuntu1.1+esm1","1.8.16+docs-4ubuntu1.1+esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"hdf5-helpers","binary_version":"1.8.16+docs-4ubuntu1.1+esm2"},{"binary_name":"hdf5-tools","binary_version":"1.8.16+docs-4ubuntu1.1+esm2"},{"binary_version":"1.8.16+docs-4ubuntu1.1+esm2","binary_name":"libhdf5-10"},{"binary_version":"1.8.16+docs-4ubuntu1.1+esm2","binary_name":"libhdf5-cpp-11"},{"binary_version":"1.8.16+docs-4ubuntu1.1+esm2","binary_name":"libhdf5-mpich-10"},{"binary_name":"libhdf5-openmpi-10","binary_version":"1.8.16+docs-4ubuntu1.1+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19026.json"}},{"package":{"name":"hdf5","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/hdf5?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.0-patch1+docs-4","1.10.0-patch1+docs-4ubuntu0.1~esm1","1.10.0-patch1+docs-4ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.10.0-patch1+docs-4ubuntu0.1~esm2","binary_name":"hdf5-helpers"},{"binary_name":"hdf5-tools","binary_version":"1.10.0-patch1+docs-4ubuntu0.1~esm2"},{"binary_name":"libhdf5-100","binary_version":"1.10.0-patch1+docs-4ubuntu0.1~esm2"},{"binary_name":"libhdf5-cpp-100","binary_version":"1.10.0-patch1+docs-4ubuntu0.1~esm2"},{"binary_version":"1.10.0-patch1+docs-4ubuntu0.1~esm2","binary_name":"libhdf5-java"},{"binary_name":"libhdf5-jni","binary_version":"1.10.0-patch1+docs-4ubuntu0.1~esm2"},{"binary_name":"libhdf5-mpich-100","binary_version":"1.10.0-patch1+docs-4ubuntu0.1~esm2"},{"binary_name":"libhdf5-openmpi-100","binary_version":"1.10.0-patch1+docs-4ubuntu0.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19026.json"}},{"package":{"name":"hdf5","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/hdf5?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.4+repack-10","1.10.4+repack-11","1.10.4+repack-11ubuntu1","1.10.4+repack-11ubuntu1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"hdf5-helpers","binary_version":"1.10.4+repack-11ubuntu1+esm1"},{"binary_name":"hdf5-tools","binary_version":"1.10.4+repack-11ubuntu1+esm1"},{"binary_name":"libhdf5-103","binary_version":"1.10.4+repack-11ubuntu1+esm1"},{"binary_name":"libhdf5-cpp-103","binary_version":"1.10.4+repack-11ubuntu1+esm1"},{"binary_name":"libhdf5-java","binary_version":"1.10.4+repack-11ubuntu1+esm1"},{"binary_name":"libhdf5-jni","binary_version":"1.10.4+repack-11ubuntu1+esm1"},{"binary_name":"libhdf5-mpich-103","binary_version":"1.10.4+repack-11ubuntu1+esm1"},{"binary_name":"libhdf5-openmpi-103","binary_version":"1.10.4+repack-11ubuntu1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19026.json"}},{"package":{"name":"hdf5","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/hdf5?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.6+repack-5","1.10.7+repack-4ubuntu1",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