CVE-2026-26200

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.

• CWE-122
• CWE-787
• CWE-131

• https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5p2m-j456-9mr2Exploit, Third Party Advisory
• 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

Published

Feb 19, 2026

Last Modified

Jul 15, 2026

Status

Modified

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