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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-19023
StatePUBLISHED
AssignerHDFG
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-05 23:16:53 UTC
Updated2026-08-05 23:16:53 UTC
DescriptionUntrusted pointer dereference in the render_bin_output function in the h5dump tool in HDF5 before 2.1.1 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.

Risk And Classification

Primary CVSS: v4.0 0 NONE from 0253b833-3e77-4dfe-9d57-17db1a2f0a74

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-822 | CWE-822 CWE-822 Untrusted pointer dereference

VersionSourceTypeScoreSeverityVector
4.00253b833-3e77-4dfe-9d57-17db1a2f0a74Secondary0NONECVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/C...
4.0CNACVSS0NONECVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/E:U

CVSS v4.0 Breakdown

Attack Vector
Local
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
Passive
Confidentiality
None
Integrity
None
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA The HDF Group HDF5 affected <= 2.1.1 custom Not specified

References

ReferenceSourceLinkTags
github.com/HDFGroup/hdf5/issues/6486 0253b833-3e77-4dfe-9d57-17db1a2f0a74 github.com
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