# CVE-2026-19023

## Summary

- **CVE ID:** CVE-2026-19023
- **Severity:** MEDIUM
- **CVSS Score:** 6.8 (CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-822
- **Published:** Aug 5, 2026
- **Last Modified:** Aug 6, 2026

## Description

Untrusted pointer dereference in the render_bin_output function in the h5dump tool in HDF5 before 2.1.1 allows attackers to cause a denial of service via a variable-length string dataset with more than one element dumped in binary mode, which corrupts the per-element stride calculation and causes subsequent elements to be read from a misaligned offset and dereferenced as a pointer.

## Affected Products

- The HDF Group — HDF5 (<= 2.1.1)
- The HDF Group — HDF5 (<= 2.3.0)

## References

- [CNA](https://github.com/HDFGroup/hdf5/issues/6486)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.12%
- **EPSS Percentile:** 1.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._