CVE-2026-26200 HIGH

CVE-2026-26200: HDF5 Affected by H5T__conv_struct_opt Heap Buffer Overflow

Vendor Hdfgroup
Product hdf5
Weakness CWE-122
Published February 19, 2026
Last update June 30, 2026

CVSS base score

7.8/10
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

February 19, 2026 CVE published
June 30, 2026 Record updated