MEDIUM 6.8 NVD
CVE-2026-19028
H5Z__filter_fletcher32 in H5Zfletcher32.c in HDF5 through 2.3.0 computes the data length to checksum by subtracting the 4-byte trailing checksum size from the i
H5Z__filter_fletcher32 in H5Zfletcher32.c in HDF5 through 2.3.0 computes the data length to checksum by subtracting the 4-byte trailing checksum size from the input buffer size without checking that the buffer is at least 4 bytes, allowing a size_t underflow. This allows attackers to cause a denial of service (massively out-of-bounds read and application crash in H5_checksum_fletcher32) via a crafted HDF5 file with a Fletcher32-filtered chunk smaller than 4 bytes, triggered via H5Dread, e.g. by the h5ls or h5dump tools.
References
- https://github.com/HDFGroup/hdf5/issues/6488
- https://github.com/HDFGroup/hdf5/issues/6490
- https://github.com/HDFGroup/hdf5/pull/6497
This medium severity vulnerability with a CVSS score of 6.8 was published on 2026-08-06 via NVD.
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