{"id":"CVE-2026-26200","state":"PUBLISHED","title":"HDF5 Affected by H5T__conv_struct_opt Heap Buffer Overflow","description":"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.","publishedAt":"2026-02-19T19:19:10.512Z","updatedAt":"2026-07-15T01:15:09.607Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["HDFGroup hdf5"],"affected":[{"vendor":"HDFGroup","product":"hdf5","versions":[{"version":"< 1.14.4-2","status":"affected"}]}],"references":["https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5p2m-j456-9mr2","https://access.redhat.com/security/cve/CVE-2026-26200","https://bugzilla.redhat.com/show_bug.cgi?id=2441088","https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26200.json"],"weaknesses":["CWE-122","CWE-131"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/26xxx/CVE-2026-26200.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-26200","state":"PUBLISHED","datePublished":"2026-02-19T19:19:10.512Z","dateUpdated":"2026-07-15T01:15:09.607Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-02-11T19:56:24.813Z"},"containers":{"cna":{"title":"HDF5 Affected by H5T__conv_struct_opt Heap Buffer Overflow","descriptions":[{"lang":"en","value":"HDF5 is software for managing data. 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An attacker who can control an `h5` file parsed by HDF5 can trigger a write-based heap buffer overflow. 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