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CVE-2026-34734

Hdfgroup Hdf5 use-after-free

7.8 HIGHPublic exploitEPSS 0.19%
  1. Published9 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Hdfgroup Hdf5< 1.14.1-2

Remediation

Fixed in
Hdfgroup Hdf5≥ 1.14.1-2

References

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Frequently asked

Is CVE-2026-34734 being actively exploited?

CVE-2026-34734 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.19%.

How severe is CVE-2026-34734?

CVE-2026-34734 has a CVSS 3.1 base score of 7.8, rated high. EPSS estimates a 0.19% probability of exploitation.

Which products are affected by CVE-2026-34734?

Affected products include Hdfgroup Hdf5.

How do I fix CVE-2026-34734?

Upgrade affected software to a fixed version, for example Hdfgroup Hdf5 1.14.1-2 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34734 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.