CVE-2026-26200CWE-122

HDF5 Affected by H5T__conv_struct_opt Heap Buffer Overflow

High · published February 19, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
34.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00415 · 34.8th percentile
Weakness
CWE-122 · Heap-based Buffer Overflow
Published
2026-02-19T19:19Z
EPSS history
Timeline
  • 19 FEB 19:19Z
    HDF5 Affected by H5T__conv_struct_opt Heap Buffer Overflow
    cvelistv5