CVE-2026-26200
HIGHCVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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4Description
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.
Analysis
Heap buffer overflow in HDF5 versions prior to 1.14.4-2 allows attackers to trigger denial-of-service or potentially achieve code execution by crafting malicious h5 files. The vulnerability affects any system parsing untrusted HDF5 data files and has public exploit code available. …
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Remediation
Within 24 hours: Identify all systems running HDF5 and restrict file upload/import capabilities to trusted sources only; disable HDF5 processing of untrusted files if operationally feasible. Within 7 days: Implement network segmentation to isolate HDF5-dependent systems; deploy monitoring for suspicious file access and process execution on affected systems. …
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