Review reviewHigh

CVE-2026-34734

HDFGroup hdf5, Red Hat Enterprise Linux AI (RHEL AI) 3

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: 7.8
EPSS: 0.19%
CISA KEV: Not listed
Published: 2026.04.10

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.19%

Technical severityCVSS 7.8

Vulnerability overview

Affected product and versions

Product: HDFGroup hdf5, Red Hat Enterprise Linux AI (RHEL AI) 3
Affected versions: >= <= 1.14.1-2, < 1.14.1-2
Fixed versions: 1.14.1-2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that HDFGroup hdf5, Red Hat Enterprise Linux AI (RHEL AI) 3 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE: CWE-416, CWE-825