CVE-2026-34734
High
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.
SeverityHigh
CVSS7.8
Exploit probability—
ProductHdfgroup Hdf5
PublishedApr 9, 2026
First seenApr 9, 2026
Weakness typeCWE-416Use after free
How to fix
Update
- hdfgroup hdf51.14.1-2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| hdfgroup hdf5 | v < 1.14.1-2 | 1.14.1-2 |
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