CVE-2026-34734 HIGH

CVE-2026-34734: HDF5: H5T__conv_struct Use After Free

Vendor Hdfgroup
Product hdf5
Weakness CWE-416
Published April 9, 2026
Last update June 30, 2026
View on NVD All CVEs

CVSS base score

7.8/10
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 9, 2026 CVE published
June 30, 2026 Record updated