HDFGroup HDF5 up to 1.14.6 H5Iget_name size buffer overflow

Summaryinfo

A vulnerability was found in HDFGroup HDF5 up to 1.14.6. It has been declared as critical. This affects an unknown part of the component H5Iget_name. Such manipulation of the argument size leads to buffer overflow. This vulnerability is traded as CVE-2026-26199. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in HDFGroup HDF5 up to 1.14.6 and classified as critical. Affected by this issue is some unknown processing of the component H5Iget_name. The manipulation of the argument size with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. CVE summarizes:

HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If `H5Iget_name` is invoked on a group id with `0` for the size parameter, it will underflow when trying to place a null terminator in the buffer. This can occur if `H5Iget_name` is invoked in a way where `size` can be forced to zero, and there is important data before the `name` buffer.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-26199 since 02/11/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/20/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Database Software

Vendor

• HDFGroup

Name

• HDF5

Version

• 1.14.0
• 1.14.1
• 1.14.2
• 1.14.3
• 1.14.4
• 1.14.5
• 1.14.6

License

• free

Website

• Product: https://github.com/HDFGroup/hdf5/

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