CVE-2026-26199

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.

References

• https://github.com/HDFGroup/hdf5/blob/develop/src/H5Gname.c#L474
• https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc
• https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc