CVE-2026-34734

HighCVSS 7.8/10Last modified Jul 15, 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.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-416 CWE-825

Affected software

No affected versions have been published.

Timeline

Published: Apr 9, 2026
Last modified: Jul 15, 2026
NVD status: Modified

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