CVE-2026-26199
Medium
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.
SeverityMedium
CVSS6.5
Exploit probability—
ProductHdfgroup Hdf5
PublishedJul 20, 2026
First seenJul 20, 2026
Weakness typeCWE-124CWE-124
How to fix
Update
- hdfgroup hdf52.1.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| hdfgroup hdf5 | v < 2.1.0 | 2.1.0 |
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