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.

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Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 20 Feb 2026 20:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-787
CPEs cpe:2.3:a:hdfgroup:hdf5:*:*:*:*:*:*:*:*

Fri, 20 Feb 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-131
References
Metrics threat_severity

None

threat_severity

Important


Fri, 20 Feb 2026 10:15:00 +0000

Type Values Removed Values Added
First Time appeared Hdfgroup
Hdfgroup hdf5
Vendors & Products Hdfgroup
Hdfgroup hdf5

Fri, 20 Feb 2026 01:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 19 Feb 2026 20:00:00 +0000

Type Values Removed Values Added
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.
Title HDF5 Affected by H5T__conv_struct_opt Heap Buffer Overflow
Weaknesses CWE-122
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-02-19T21:23:04.319Z

Reserved: 2026-02-11T19:56:24.813Z

Link: CVE-2026-26200

cve-icon Vulnrichment

Updated: 2026-02-19T21:16:39.592Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-19T20:25:42.610

Modified: 2026-02-20T20:14:37.683

Link: CVE-2026-26200

cve-icon Redhat

Severity : Important

Publid Date: 2026-02-19T19:19:10Z

Links: CVE-2026-26200 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-02-20T10:05:49Z

Weaknesses