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.
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References
History
Wed, 05 Aug 2026 23:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | HDF5 integer underflow in Fletcher32 filter leads to massive out-of-bounds read | |
| Weaknesses | CWE-125 CWE-1284 CWE-190 |
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cvssV4_0
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MITRE
Status: PUBLISHED
Assigner: HDFG
Published:
Updated: 2026-08-05T23:15:09.580Z
Reserved: 2026-08-05T22:14:41.781Z
Link: CVE-2026-19028
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
Updated: 2026-08-06T00:30:03Z