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    CVE-2026-19026

    H5Z__filter_nbit in H5Znbit.c in HDF5 through 2.3.0 dereferences cd_values[0] through cd_values[4] without validating that cd_values is non-NULL or that cd_nelmts is at least 5, the fixed size of the filter's header. This allows attackers to cause a denial of service via a crafted HDF5 file that stores the N-Bit filter pipeline message with zero client-data values, opened and read via H5Dread, e.g. by the h5ls or h5repack tools.

    Published:Aug 5, 2026
    Last Modified:Aug 7, 2026
    EPS:Aug 5, 2026
    EPSS Score:0.00127
    CVSS Score:6.8

    Affected Products

    Vendor
    Hdfgroup
    Product
    Hdf5

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-19028 (CVSS 6.8) — H5Z__filter_fletcher32 in H5Zfletcher32.c in HDF5 through 2.3.0 computes the data length to checksum by subtra…
    CVE-2026-19027 (CVSS 6.9) — The H5Z__nbit_decompress_one_byte, H5Z__nbit_decompress_one_nooptype, and H5Z__nbit_decompress_one_atomic func…
    CVE-2026-19025 (CVSS 6.8) — H5O__layout_decode in H5Olayout.c in HDF5 through 2.3.0 does not validate that a chunked dataset's stored chun…
    CVE-2026-19024 (CVSS 8.2) — NULL pointer dereference in H5Pget_fill_value in HDF5 before 2.3.0 allows attackers to cause a denial of servi…
    CVE-2026-19023 (CVSS 6.8) — Untrusted pointer dereference in the render_bin_output function in the h5dump tool in HDF5 before 2.3.0 allows…
    CVE-2026-17574 (CVSS 5.2) — HDF5 contains a NULL pointer dereference vulnerability. Processing a crafted HDF5 file containing an attribute…
    CVE-2026-17573 (CVSS 4) — A double free vulnerability was discovered in the HDF5 library. Processing a crafted HDF5 file containing an o…
    CVE-2026-17572 (CVSS 5.5) — Heap-based buffer overflow in the SOHM list-index deserialization code in HDF5 through 2.1.1 on all platforms …
    CVE-2026-26199 (CVSS 5.9) — HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If `H5…
    CVE-2026-26197 (CVSS 5.9) — HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If a f…

    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