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CVE-2026-34734

HDF5: H5T__conv_struct Use After Free

Published: 4/9/2026 Last updated: 4/13/2026 Reserved: 3/30/2026

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.

CNA assigner: GitHub_M (a0819718-46f1-4df5-94e2-005712e83aaa) Requested by: n/a

Metrics

Version Score Severity Vector String
3.1 7.8 High CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Opam packages affected (1)

hdf5

Products affected (2)

Product Vendor Version
hdf5 HDFGroup n/a
hdf5 HDFGroup n/a

References (4)