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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Hdfgroup | Hdf5 | < 2.1.0 |
Related Weaknesses (CWE)
References
- https://github.com/HDFGroup/hdf5/blob/develop/src/H5Gname.c#L474Exploit
- https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vcVendor Advisory
- https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vcVendor Advisory
FAQ
What is CVE-2026-26199?
CVE-2026-26199 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 whe...
How severe is CVE-2026-26199?
CVE-2026-26199 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-26199?
Check the references section above for vendor advisories and patch information. Affected products include: Hdfgroup Hdf5.