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{"bugzilla": {"description": "hdf5: hdf5: Arbitrary code execution via heap-based buffer overflow", "id": "2547141", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2547141"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A heap-based buffer overflow in H5VM_array_fill() in src/H5VM.c in HDF5 before 2.2.0 lets a remote attacker cause an application crash and possibly execute arbitrary code with a crafted HDF5 file. When a dataset's unallocated chunks are read, H5D__fill_init() fills the fill-value buffer from datatype and dataspace metadata in the file. If that metadata is inconsistent with the buffer's allocated size, the write goes past the end of the buffer. The attacker can control the content written through the fill value stored in the file.", "A flaw was found in HDF5. An attacker could exploit this heap-based buffer overflow by providing a specially crafted HDF5 file to an application. Due to improper metadata validation when reading unallocated dataset chunks, the library writes data past the boundary of an allocated memory buffer. Successful exploitation could allow the attacker to execute arbitrary code or cause an application crash resulting in a Denial of Service (DoS)."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-106547", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "hdf5", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-10-06T20:14:41Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-106547\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-106547\nhttps://github.com/HDFGroup/hdf5/pull/6529"], "statement": "An IMPORTANT severity heap-based buffer overflow flaw was found in the HDF5 library as shipped in Red Hat Hardened Images (hummingbird stream, component hdf5). The flaw lies in H5VM_array_fill() in src/H5VM.c: when a dataset's unallocated chunks are read, H5D__fill_init() fills the fill-value buffer from datatype and dataspace metadata stored in the file, and if that metadata is inconsistent with the buffer's allocated size, data is written past the end of the buffer. A remote attacker who can supply a specially crafted HDF5 file to an application using the library could exploit this flaw to crash the application, causing a denial of service, or possibly execute arbitrary code, since the attacker can control the content written through the fill value stored in the file. Exploitation requires a user or application process to open or parse the malicious HDF5 file, and its effects are confined to the context of the vulnerable application. This component is handled with a delegated resolution, meaning a fix is being pursued for the affected product. Red Hat rates this flaw IMPORTANT with a CVSS 3.1 base score of 7.8 (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H), while the upstream CVEORG record assigns a CVSS 4.0 score of 8.5; the difference stems from the scoring-version and metric differences, and both indicate a high impact on the confidentiality, integrity, and availability of the vulnerable application.", "threat_severity": "Important"}