# CVE-2026-19025

## Summary

- **CVE ID:** CVE-2026-19025
- **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-369
- **Published:** Aug 5, 2026
- **Last Modified:** Aug 6, 2026

## Description

H5O__layout_decode in H5Olayout.c in HDF5 through 2.3.0 does not validate that a chunked dataset's stored chunk-layout dimensionality matches its dataspace rank when an existing dataset is opened, whereas this check is performed only at dataset-creation time. This allows attackers to cause a denial of service (divide-by-zero and application crash in H5S__hyper_iter_get_seq_list in src/H5Shyper.c) via a crafted HDF5 file with mismatched chunk/dataspace ranks that is opened and read via H5Dopen2 and H5Dread, e.g. by the h5repack tool.

## Affected Products

- The HDF Group — HDF5 (<= 2.3.0)

## References

- [CNA](https://github.com/HDFGroup/hdf5/issues/6491)

## Exploitation Prediction (EPSS)

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

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