CVE-2026-26200
Heap Buffer Overflow in HDF5 Allows Denial of Service
Publication date: 2026-02-19
Last updated on: 2026-02-20
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| hdfgroup | hdf5 | to 1.14.4.2 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| 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(). |
| CWE-787 | The product writes data past the end, or before the beginning, of the intended buffer. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
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.
How can this vulnerability impact me? :
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.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
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.