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HDF5 nbit truncated chunk โ€” silent wrong output

Overview

HDF5 nbit filter (H5Z_FILTER_NBIT, ID=5) accepts a chunked dataset whose compressed chunk has been truncated. H5Dread returns success (status=0) with no exception, but the materialized values differ from the expected values.

Files

File Description
baseline_nbit.h5 Valid nbit-compressed HDF5 file; weights = [0..19]
crafted_nbit_truncated_chunk.h5 Same structure; nbit chunk truncated 80โ†’20 bytes
reproduce.py Reproduces silent wrong output via h5py
inspect_artifacts.py Inspects file structure and source gap
runtime_results.json C-harness runtime output
distinctness_matrix.json Distinctness from F5 deflate and CVE-2024-32615
cve_2024_32615_diff.md CVE diff analysis
SHA256SUMS.txt File hashes

Reproduction

pip install h5py numpy
python reproduce.py

Expected: WRONG_ELEMENTS=15/20, EXCEPTION_RAISED=False

Non-Claims

  • No RCE, ACE, or memory corruption confirmed
  • No arbitrary read/write
  • No High/Critical/CVSS assertion
  • Not a duplicate of CVE-2024-32615 (distinct root, distinct function, distinct fix status)
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