Review reviewHigh

CVE-2026-26200

HDFGroup hdf5, Red Hat Enterprise Linux AI (RHEL AI) 3

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.

CVSS: 7.8
EPSS: 0.36%
CISA KEV: Not listed
Published: 2026.02.20

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.36%

Technical severityCVSS 7.8

Vulnerability overview

Affected product and versions

Product: HDFGroup hdf5, Red Hat Enterprise Linux AI (RHEL AI) 3
Affected versions: >= < 1.14.4-2, < 1.14.4.2
Fixed versions: 1.14.4.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that HDFGroup hdf5, Red Hat Enterprise Linux AI (RHEL AI) 3 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE: CWE-122, CWE-131, CWE-787