CVE-2026-19023

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

State: Published
Severity: 6.8 Medium
Published: Aug 5, 2026
Updated: Aug 6, 2026
Reserved: Aug 5, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	6.8 Medium	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	HDFG

Weaknesses

CWE-822 Untrusted pointer dereference

Affected Products

Product	Versions
HDF5The HDF Group	<= 2.3.0Affected

References

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

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