HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If a file is corrupted such that an array datatype's size, the number of elements, and the element size are not in agreement it can trigger an out of bounds read. The array datatype stores the full size of the datatype (`dt->shared->size`) separately from the number of elements (`dt->shared->u.array.nelem`) and the element size (`dt->shared->parent->shared->size`). If any one of these are corrupted so that they don't align with the others (element size * nelem = full size), it can lead to an out of bounds read. Depending on what is corrupted, it can alter the type of out of bounds read triggered. The vulnerability is present only in files that have been maliciously altered, as its generally not possible to independently alter the full size of the datatype, the element count and the element size. As such, this is only present if a malicious actor is altering files, and won't appear in regular usage.
Advisories
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Fixes
Solution
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Workaround
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References
History
Tue, 21 Jul 2026 00:00:00 +0000
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Hdfgroup
Hdfgroup hdf5 |
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| Vendors & Products |
Hdfgroup
Hdfgroup hdf5 |
Mon, 20 Jul 2026 16:30:00 +0000
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ssvc
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Mon, 20 Jul 2026 15:30:00 +0000
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| Description | HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If a file is corrupted such that an array datatype's size, the number of elements, and the element size are not in agreement it can trigger an out of bounds read. The array datatype stores the full size of the datatype (`dt->shared->size`) separately from the number of elements (`dt->shared->u.array.nelem`) and the element size (`dt->shared->parent->shared->size`). If any one of these are corrupted so that they don't align with the others (element size * nelem = full size), it can lead to an out of bounds read. Depending on what is corrupted, it can alter the type of out of bounds read triggered. The vulnerability is present only in files that have been maliciously altered, as its generally not possible to independently alter the full size of the datatype, the element count and the element size. As such, this is only present if a malicious actor is altering files, and won't appear in regular usage. | |
| Title | Array full size, element count, and element size are not checked to make sure they match in H5Odtype.c | |
| Weaknesses | CWE-125 | |
| References |
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| Metrics |
cvssV4_0
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Projects
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-07-20T15:34:11.301Z
Reserved: 2026-02-11T19:56:24.813Z
Link: CVE-2026-26197
Updated: 2026-07-20T15:34:04.810Z
No data.
No data.
OpenCVE Enrichment
Updated: 2026-07-20T23:45:04Z
Weaknesses