Medium 6.8Published Aug 5, 2026

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

Updated under an hour ago (2026-10-19 08:23 UTC)

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It affects The HDF Group HDF5. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for The HDF Group HDF5

Exploited in the last 30 days

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.

CVSS: 6.8 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-822
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: HDFG
NVD analysis: Awaiting Analysis
Record last updated: Aug 6, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

The HDF Group HDF5 hdf_group:hdf5 (from the name)	through 2.3.0	CNA record

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.