{"id":"CVE-2026-26200","summary":"HDF5 Affected by H5T__conv_struct_opt Heap Buffer Overflow","details":"HDF5 is software for managing data. Prior to version 1.14.4-2, an attacker who can control an `h5` file parsed by HDF5 can trigger a write-based heap buffer overflow condition. This can lead to a denial-of-service condition, and potentially further issues such as remote code execution depending on the practical exploitability of the heap overflow against modern operating systems. Real-world exploitability of this issue in terms of remote-code execution is currently unknown. Version 1.14.4-2 fixes the issue.","aliases":["GHSA-5p2m-j456-9mr2"],"modified":"2026-08-12T03:51:31.188960122Z","published":"2026-02-19T19:19:10.512Z","database_specific":{"cwe_ids":["CWE-122"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26200.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26200.json"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-26200"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26200.json"},{"type":"ADVISORY","url":"https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5p2m-j456-9mr2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-26200"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2441088"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/hdfgroup/hdf5","events":[{"introduced":"0"},{"fixed":"f0ecc8bc26972119fb31b1cd548ea23fff4a3227"}],"database_specific":{"cpe":"cpe:2.3:a:hdfgroup:hdf5:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"1.14.4-2"},{"fixed":"1.14.4.2"}],"source":["AFFECTED_FIELD","CPE_RANGE"]}}],"versions":["hdf5_1.14.4.1","hdf5_1.14.4","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-2026-26200.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}