Description
H5Z__filter_nbit in H5Znbit.c in HDF5 through 2.3.0 dereferences cd_values[0] through cd_values[4] without validating that cd_values is non-NULL or that cd_nelmts is at least 5, the fixed size of the filter's header. This allows attackers to cause a denial of service via a crafted HDF5 file that stores the N-Bit filter pipeline message with zero client-data values, opened and read via H5Dread, e.g. by the h5ls or h5repack tools.
Published: 2026-08-05
Score: 6.8 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
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History

Wed, 05 Aug 2026 23:00:00 +0000

Type Values Removed Values Added
Description H5Z__filter_nbit in H5Znbit.c in HDF5 through 2.3.0 dereferences cd_values[0] through cd_values[4] without validating that cd_values is non-NULL or that cd_nelmts is at least 5, the fixed size of the filter's header. This allows attackers to cause a denial of service via a crafted HDF5 file that stores the N-Bit filter pipeline message with zero client-data values, opened and read via H5Dread, e.g. by the h5ls or h5repack tools.
Title Nbit filter NULL/short parameter-array dereference
Weaknesses CWE-1284
CWE-476
References
Metrics cvssV4_0

{'score': 6.8, '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'}

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cve-icon MITRE

Status: PUBLISHED

Assigner: HDFG

Published:

Updated: 2026-08-05T22:47:58.227Z

Reserved: 2026-08-05T22:14:40.349Z

Link: CVE-2026-19026

cve-icon Vulnrichment

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cve-icon NVD

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cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses
  • CWE-1284

    Improper Validation of Specified Quantity in Input

  • CWE-476

    NULL Pointer Dereference