CVE-2026-19024
High
Description
NULL pointer dereference in H5Pget_fill_value in HDF5 before 2.3.0 allows attackers to cause a denial of service via a dataset whose version 1 or 2 fill value message has the "defined" flag set together with a negative size field, which is not normalized to the library's "undefined" sentinel and reaches H5T_path_find with a NULL datatype.
SeverityHigh
CVSS8.2
Exploit probability—
ProductHDF5
PublishedAug 5, 2026
First seenAug 5, 2026
Weakness typeCWE-476NULL pointer dereference
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| The HDF Group HDF5 | <= 2.3.0 | — |
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