{"id":"CVE-2026-26199","summary":"Buffer underflow in `H5Iget_name `/`H5G_get_name` if size is zero","details":"HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If `H5Iget_name` is invoked on a group id with `0` for the size parameter, it will underflow when trying to place a null terminator in the buffer. This can occur if `H5Iget_name` is invoked in a way where `size` can be forced to zero, and there is important data before the `name` buffer.","aliases":["GHSA-5c6x-jmgf-f5vc"],"modified":"2026-07-22T05:32:22.333020959Z","published":"2026-07-20T14:59:35.038Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-124"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26199.json"},"references":[{"type":"WEB","url":"https://github.com/HDFGroup/hdf5/blob/develop/src/H5Gname.c#L474"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26199.json"},{"type":"ADVISORY","url":"https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-26199"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/hdfgroup/hdf5","events":[{"introduced":"0"},{"last_affected":"7bf340440909d468dbb3cf41f0ea0d87f5050cea"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"last_affected":"1.14.6"}]}}],"versions":["hdf5_1.14.6","hdf5-1.14.6","hdf5_1.14.5","hdf5-1.14.5","snapshot-1.14","hdf5-1_13_0-rc6","hdf5-1_13_0-rc5","hdf5-1_13_0-rc4","hdf5-1_13_0-rc3","hdf5-1_13_0-rc2","hdf5-1_13_0-rc1","vms_last_support_trunk","before_removing_mpiposix_vfd","hdf5-1_9-start","hdf5-1_8_0-beta5","hdf5-1_8_0-beta4","hdf5-1_8_0-beta3","hdf5-1_8_0-beta2","hdf5-1_8_0-beta1","hdf5-1_8_0-alpha4","hdf5-1_8_0-alpha3","hdf5-1_8_0-alpha2","before_removing_fphdf5","before_removing_docs","before_removing_tbbt_code","before_signed_unsigned_changes","hdf5-1_6_2","hdf5-1_6_1","hdf5-1_6_0","hdf5-1_4_0","hdf5-1_4_1","hdf5-1_3_1","hdf5-1_3_0","hdf5-1_2_1","hdf5-1_2_0beta","hdf5-1_2_0-beta1-update2","hdf5-1_2_0","hdf5-1_0_1","hdf5-1_0_0","r1_1beta1","hdf5-1_0_0-alpha2","proto1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26199.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}