CVE-2026-34734CWE-416

HDF5: H5T__conv_struct Use After Free

High · published April 9, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
8.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00191 · 8.3th percentile
Weakness
CWE-416 · Use After Free
Published
2026-04-09T19:01Z
EPSS history
Timeline
  • 09 APR 19:01Z
    HDF5: H5T__conv_struct Use After Free
    cvelistv5