{"id":"AZL-94499","summary":"CVE-2026-19028 affecting package hdf5 1.14.6-4","details":"H5Z__filter_fletcher32 in H5Zfletcher32.c in HDF5 through 2.3.0 computes the data length to checksum by subtracting the 4-byte trailing checksum size from the input buffer size without checking that the buffer is at least 4 bytes, allowing a size_t underflow. This allows attackers to cause a denial of service (massively out-of-bounds read and application crash in H5_checksum_fletcher32) via a crafted HDF5 file with a Fletcher32-filtered chunk smaller than 4 bytes, triggered via H5Dread, e.g. by the h5ls or h5dump tools.","modified":"2026-09-02T06:51:55Z","published":"2026-08-06T00:16:53Z","upstream":["CVE-2026-19028"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-19028"}],"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-94499.json"}}],"schema_version":"1.9.0"}