CVE-2026-19024
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.
CSIRTS triage
- What
- H5Pget_fill_value function dereferences a null pointer when processing malformed fill value messages.
- Who is affected
- Deployments processing untrusted HDF5 files with crafted fill value metadata.
- Urgency
- Moderate; null pointer dereference causes denial of service to HDF5 applications.
- Action
- Update to a patched HDF5 version that validates fill value message structure.
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Exploitation outlook
- Low exploitation risk0.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all EPSS-scored CVEs.
Advisory coverage (2)
External references
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