CVE-2026-19023
Untrusted pointer dereference in the render_bin_output function in the h5dump tool in HDF5 before 2.3.0 allows attackers to cause a denial of service via a variable-length string dataset with more than one element dumped in binary mode, which corrupts the per-element stride calculation and causes subsequent elements to be read from a misaligned offset and dereferenced as a pointer.
CSIRTS triage
- What
- Untrusted pointer dereference in h5dump tool when processing variable-length string datasets in binary mode.
- Who is affected
- Users running h5dump on untrusted HDF5 files with variable-length string datasets.
- Urgency
- Severity unknown; pointer dereference can cause crash or code execution.
- Action
- Update HDF5 to patched version or avoid processing untrusted binary datasets with h5dump.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.
Advisory coverage (2)
External references
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