{"id":"CVE-2026-19027","revision":"d6cde47075b3405aa23af74c1ba42a9f","records":[{"revision":"d6cde47075b3405aa23af74c1ba42a9f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-19027","aliases":[],"title":"HDF5 out-of-bounds heap read in N-Bit filter decompression","description":"The H5Z__nbit_decompress_one_byte, H5Z__nbit_decompress_one_nooptype, and H5Z__nbit_decompress_one_atomic functions in H5Znbit.c in HDF5\nprior to 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.","state":0,"publishedAt":"2026-08-05T23:12:20.658+00:00","modifiedAt":"2026-10-06T20:33:19.385+00:00","affected":[{"ecosystem":"Vendor product","name":"HDF5","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"The HDF Group\",\n                    \"product\": \"HDF5\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"<=2.3.0\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N","score":6.9,"severity":"MEDIUM"}],"references":["https://github.com/HDFGroup/hdf5/pull/6497","https://github.com/HDFGroup/hdf5/issues/6489","https://github.com/HDFGroup/hdf5/issues/6492"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-19027","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-19027","identifiers":["CVE-2026-19027"]},"retained":false,"historicalAffected":[]}],"coverage":[]}