CVE-2026-26199HDF5 is a high-performance library and a file format specification that implements the HDF5 data model.
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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.
- CVSS
- 6.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
- Weakness (CWE)
- CWE-124
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jul 29, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
hdfgroup hdf5 hdfgroup:hdf5 | before 2.1.0 | NVD |
References
- https://github.com/HDFGroup/hdf5/blob/develop/src/H5Gname.c#L474exploit
- https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vcvendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.