CVE-2026-19023 — HDF5 h5dump Untrusted Pointer Dereference in Binary Output of Variable-Length String Datasets

CVE-2026-19023

HDF5 h5dump Untrusted Pointer Dereference in Binary Output of Variable-Length String Datasets PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
The HDF Group / HDF5	affected <= 2.3.0

CWE

CWE-822

References

https://github.com/HDFGroup/hdf5/issues/6486

ADP enrichment

CISA-ADP

No English description supplied.

https://github.com/HDFGroup/hdf5/issues/6486