CVE-2026-26199— Buffer underflow in `H5Iget_name `/`H5G_get_name` if size is zero
Possible ATT&CK Techniques 1AI
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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
II. Public POCs for CVE-2026-26199
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Vendor Advisories for CVE-2026-26199 (1)
IV. Related Vulnerabilities
Same product: hdf5
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NULL Pointer Dereference in HDF5 via Invalid Variable-Length - CVE-2026-17573
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Array full size, element count, and element size are not che - CVE-2026-29043
HDF5 H5T__ref_mem_setnull Heap Buffer Overflow
Same weakness: CWE-124
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YAML::Syck versions before 1.38 for Perl has an out-of-bound - CVE-2026-41499
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V. Comments for CVE-2026-26199
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