The H5Z__nbit_decompress_one_byte, H5Z__nbit_decompress_one_nooptype, and H5Z__nbit_decompress_one_atomic functions in H5Znbit.c in HDF5 through 2.3.0 advance a read index into the compressed chunk buffer without bounding it against the buffer's actual size. This allows attackers to cause an out-of-bounds heap read, and in constrained cases disclosure of adjacent heap memory into decompressed dataset values, via a crafted HDF5 file whose N-Bit filter parameters describe more decompressed data than the stored compressed chunk actually contains, triggered via H5Dread, e.g. by the h5ls or h5repack tools.
Metrics
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History
Wed, 05 Aug 2026 23:30:00 +0000
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| Description | The H5Z__nbit_decompress_one_byte, H5Z__nbit_decompress_one_nooptype, and H5Z__nbit_decompress_one_atomic functions in H5Znbit.c in HDF5 through 2.3.0 advance a read index into the compressed chunk buffer without bounding it against the buffer's actual size. This allows attackers to cause an out-of-bounds heap read, and in constrained cases disclosure of adjacent heap memory into decompressed dataset values, via a crafted HDF5 file whose N-Bit filter parameters describe more decompressed data than the stored compressed chunk actually contains, triggered via H5Dread, e.g. by the h5ls or h5repack tools. | |
| Title | HDF5 out-of-bounds heap read in N-Bit filter decompression | |
| Weaknesses | CWE-125 | |
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cvssV4_0
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MITRE
Status: PUBLISHED
Assigner: HDFG
Published:
Updated: 2026-08-05T23:12:20.658Z
Reserved: 2026-08-05T22:14:41.114Z
Link: CVE-2026-19027
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
Updated: 2026-08-06T00:30:03Z