CVE-2026-19028

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{"bugzilla": {"description": "hdf5: HDF5: Denial of Service via integer underflow in Fletcher32 filter", "id": "2511855", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511855"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["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.", "A flaw was found in HDF5. An attacker can craft a malicious HDF5 file with a specially designed Fletcher32-filtered chunk. When this file is processed, an integer underflow occurs due to insufficient size validation, leading to a massive out-of-bounds read. This vulnerability can cause the application to crash, resulting in a denial of service."], "mitigation": {"lang": "en:us", "value": "Do not open or process untrusted HDF5 files from unverified sources using tools or services linked against the HDF5 library. Enforce file-ingestion boundaries or access controls to restrict automated parsing of untrusted datasets."}, "name": "CVE-2026-19028", "package_state": [{"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Affected", "package_name": "hdf5", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "hdf5", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-08-05T23:15:09Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-19028\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-19028\nhttps://github.com/HDFGroup/hdf5/issues/6488\nhttps://github.com/HDFGroup/hdf5/issues/6490\nhttps://github.com/HDFGroup/hdf5/pull/6497"], "statement": "An integer underflow vulnerability exists in HDF5's H5Z__filter_fletcher32() function within H5Zfletcher32.c. When reading dataset chunks via H5Dread(), the Fletcher32 filter subtracts a 4-byte checksum length from the buffer size without validating that the buffer is at least 4 bytes. An attacker can exploit this by enticing a user or service to process a crafted HDF5 file containing a sub-4-byte Fletcher32-filtered chunk, causing a size_t wraparound and massive out-of-bounds read in H5_checksum_fletcher32(). The primary impact of this flaw is an application crash leading to a denial of service.", "threat_severity": "Moderate"}

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