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CVE-2026-26199— Buffer underflow in `H5Iget_name `/`H5G_get_name` if size is zero

Quick assessment

Affected
HDFGroup hdf5
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

hdfgroup hdf5是hdfgroup组织开源的一种分层数据格式库。 HDFGroup hdf5 1.14.6及之前版本存在缓冲区错误漏洞，该漏洞源于H5Iget_name函数在处理size参数为0时，在缓冲区内放置空终止符时出现整数下溢，可能导致数据泄露。

AI Predicted 5.3 Difficulty: Easy EPSS 0.35% · P26

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
HDFGroup hdf5 <= 1.14.6 affected
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I. Basic Information for CVE-2026-26199

Vulnerability Information
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Vulnerability Title
Buffer underflow in `H5Iget_name `/`H5G_get_name` if size is zero
Source: CVE Program / CVE List V5
Vulnerability Description
HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If `H5Iget_name` is invoked on a group id with `0` for the size parameter, it will underflow when trying to place a null terminator in the buffer. This can occur if `H5Iget_name` is invoked in a way where `size` can be forced to zero, and there is important data before the `name` buffer.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
缓冲区下溢
Source: CVE Program / CVE List V5
Vulnerability Title
HDFGroup hdf5 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
hdfgroup hdf5是hdfgroup组织开源的一种分层数据格式库。 HDFGroup hdf5 1.14.6及之前版本存在缓冲区错误漏洞，该漏洞源于H5Iget_name函数在处理size参数为0时，在缓冲区内放置空终止符时出现整数下溢，可能导致数据泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
HDFGroup hdf5 <= 1.14.6 -

II. Public POCs for CVE-2026-26199

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III. Intelligence Information for CVE-2026-26199

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Vendor Advisories for CVE-2026-26199 (1)

IV. Related Vulnerabilities

Same product: hdf5
Same vendor: HDFGroup
Same weakness: CWE-124

V. Comments for CVE-2026-26199

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