Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Hdfgroup | Hdf5 | < 2.1.0 |
Related Weaknesses (CWE)
References
- https://github.com/HDFGroup/hdf5/security/advisories/GHSA-gh44-7wpq-622fExploitVendor Advisory
- https://github.com/HDFGroup/hdf5/security/advisories/GHSA-gh44-7wpq-622fExploitVendor Advisory
FAQ
What is CVE-2026-26197?
CVE-2026-26197 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 eleme...
How severe is CVE-2026-26197?
CVE-2026-26197 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-26197?
Check the references section above for vendor advisories and patch information. Affected products include: Hdfgroup Hdf5.