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CVE-2026-34734

7.8 · HIGH

HDF5 is software for managing data.

Published Apr 9, 2026CWE-416EPSS 0.19%

Overview

CVE-2026-34734 is a high-severity vulnerability. It was published on April 9, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

HDF5 is software for managing data. In 1.14.1-2 and earlier, a heap-use-after-free was found in the h5dump helper utility. An attacker who can supply a malicious h5 file can trigger a heap use-after-free. The freed object is referenced in a memmove call from H5T__conv_struct. The original object was allocated by H5D__typeinfo_init_phase3 and freed by H5D__typeinfo_term.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/HDFGroup/hdf5/security/advisories/GHSA-w7v2-9cmr-pwwjRefaccess.redhat.com/security/cve/CVE-2026-34734Refbugzilla.redhat.com/show_bug.cgi?id=2457034GitHubgithub.com/HDFGroup/hdf5/security/advisories/GHSA-w7v2-9cmr-pwwjRefsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34734.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-34734?

CVE-2026-34734 is a high-severity vulnerability. It was published on April 9, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-34734?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-34734?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-34734?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-34734 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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