CVE-2026-19028
HDF5 integer underflow in Fletcher32 filter leads to massive out-of-bounds read
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-190 CWE-125 CWE-1284 |
| Vendor | the hdf group |
| Product | hdf5 |
| Published | Aug 5, 2026 |
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Affected Versions
The HDF Group / HDF5
<=2.3.0