{"id":"CVE-2026-19024","summary":"HDF5 H5Pget_fill_value NULL Pointer Dereference via Malformed Fill Value Message","details":"NULL pointer dereference in H5Pget_fill_value in HDF5 before 2.3.0 allows attackers to cause a denial of service via a dataset whose version 1 or 2 fill value message has the \"defined\" flag set together with a negative size field, which is not normalized to the library's \"undefined\" sentinel and reaches H5T_path_find with a NULL datatype.","modified":"2026-08-07T11:50:28.818305592Z","published":"2026-08-05T22:14:29.792Z","database_specific":{"cwe_ids":["CWE-476"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/19xxx/CVE-2026-19024.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"last_affected":"2.3.0"}]},{"source":"DESCRIPTION","extracted_events":[{"introduced":"HDF5"},{"fixed":"2.3.0"}]}],"cna_assigner":"HDFG"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/19xxx/CVE-2026-19024.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-19024"},{"type":"REPORT","url":"https://github.com/HDFGroup/hdf5/issues/6487"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/hdfgroup/hdf5","events":[{"introduced":"577c192518598c7e2945683655feffcdbdf5a91b"},{"fixed":"4fde4fd787744b6a19b12032f4dad0383fbe6fbd"}],"database_specific":{"extracted_events":[{"introduced":"HDF5"},{"fixed":"2.1.1"}],"source":"DESCRIPTION"}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-19024.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H"}]}