CVE-2026-26199
Buffer underflow in `H5Iget_name `/`H5G_get_name` if size is zero
- State
- Published
- Severity
- 5.9 Medium
- Published
- Jul 20, 2026
- Updated
- Jul 20, 2026
- Reserved
- Feb 11, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.9 Medium | 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 | GitHub_M |
Weaknesses
- CWE-124 Buffer Underwrite ('Buffer Underflow')
Affected Products
| Product | Versions |
|---|---|
hdf5HDFGroup |
|
References
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