CVE-2026-26200
Received Received - Intake
Heap Buffer Overflow in HDF5 Allows Denial of Service

Publication date: 2026-02-19

Last updated on: 2026-02-20

Assigner: GitHub, Inc.

Description
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 Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2026-02-19
Last Modified
2026-02-20
Generated
2026-06-16
AI Q&A
2026-02-19
EPSS Evaluated
2026-06-15
NVD
CVE-2026-26200
EUVD
EUVD-2026-7979
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
hdfgroup hdf5 to 1.14.4.2 (exc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.
CWE-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

This vulnerability exists in HDF5 software versions prior to 1.14.4-2. It occurs when an attacker controls an 'h5' file that is parsed by HDF5, which can trigger a write-based heap buffer overflow. This overflow can cause a denial-of-service condition and may potentially allow further issues such as remote code execution, although the real-world exploitability for remote code execution is currently unknown.

Impact Analysis

The vulnerability can lead to a denial-of-service condition by causing a heap buffer overflow when processing a malicious 'h5' file. Additionally, there is a potential risk of remote code execution depending on how exploitable the heap overflow is on modern operating systems, which could allow an attacker to execute arbitrary code.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, you should upgrade HDF5 to version 1.14.4-2 or later, as this version contains the fix for the heap buffer overflow issue.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-26200. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart