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CVE-2026-34734

HDF5 - h5dump

HDF Group CVSS 7.8 Updated April 10, 2026

Executive Risk Summary

"A heap-use-after-free vulnerability was found in the h5dump helper utility of HDF5, allowing an attacker to trigger a heap use-after-free by supplying a malicious h5 file. This vulnerability affects HDF5 versions 1.14.1-2 and earlier."

Anticipated Attack Path

  1. 1. Attacker crafts a malicious h5 file
  2. 2. Victim uses the h5dump utility to process the malicious file
  3. 3. Heap use-after-free vulnerability is triggered, potentially allowing arbitrary code execution

Am I Vulnerable?

  • Verify HDF5 version is 1.14.1-2 or earlier
  • Check for malicious h5 files
  • Monitor system logs for suspicious activity related to h5dump utility

Operational Audit Arsenal

Target Type binary
Target Asset h5dump
Standard Path /usr/bin/h5dump

Manual Verification Required

This is a non-Windows asset (HDF Group). Use the target asset details and official path provided above to verify your current version against the official vendor advisories listed below.

Patch Impact Forecast

Reboot Required Unlikely

Low to moderate, depending on the usage of HDF5 and h5dump utility

Internal Work Notes

HDF5 heap-use-after-free vulnerability in h5dump utility, potential for arbitrary code execution, recommend updating to latest HDF5 version

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Intelligence Sources

Related HDF Group Threats

Data compiled from NVD, MSRC, and CISA KEV Catalog. Intelligence synthesized via AI. Scripts provided for diagnostic purposes under MIT License.