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    CVE-2026-26199

    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.

    Published:Jul 20, 2026
    Last Modified:Jul 20, 2026
    EPS:Jul 20, 2026
    EPSS Score:
    CVSS Score:5.9

    Affected Products

    Vendor
    Hdfgroup
    Product
    Hdf5

    Exploits

    https://github.com/HDFGroup/hdf5/blob/develop/src/H5Gname.c#L474

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High