{"id":"CVE-2026-19028","revision":"402785c092d745068fc6c2ce3dfc56cf","records":[{"revision":"402785c092d745068fc6c2ce3dfc56cf","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-19028","aliases":[],"title":"HDF5 integer underflow in Fletcher32 filter leads to massive out-of-bounds read","description":"H5Z__filter_fletcher32 in H5Zfletcher32.c in HDF5 prior to\u00A02.3.0 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.","state":0,"publishedAt":"2026-08-05T23:15:09.58+00:00","modifiedAt":"2026-10-06T20:32:52.6+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:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":6.8,"severity":"MEDIUM"}],"references":["https://github.com/HDFGroup/hdf5/pull/6497","https://github.com/HDFGroup/hdf5/issues/6488","https://github.com/HDFGroup/hdf5/issues/6490"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-19028","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-19028","identifiers":["CVE-2026-19028"]},"retained":false,"historicalAffected":[]}],"coverage":[]}