# CVE-2026-26199

## Summary

- **CVE ID:** CVE-2026-26199
- **Severity:** MEDIUM
- **CVSS Score:** 5.9 (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)
- **CWE:** CWE-124
- **Published:** Jul 20, 2026
- **Last Modified:** Jul 20, 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.

## Affected Products

- HDFGroup — hdf5 (<= 1.14.6)

## References

- [CNA](https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc)
- [CNA](https://github.com/HDFGroup/hdf5/blob/develop/src/H5Gname.c#L474)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.30%
- **EPSS Percentile:** 22.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._