CVE-2026-19023 MEDIUM

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

Vendor The Hdf Group
Product HDF5
Weakness CWE-822
Published August 5, 2026
Last update August 6, 2026
View on NVD All CVEs

CVSS base score

6.8/10
Attack vector Local
Attack complexity Low
Privileges required None
User interaction —
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

August 5, 2026 CVE published
August 6, 2026 Record updated