Bug 2547141 (CVE-2026-106547)

Summary: CVE-2026-106547 hdf5: hdf5: Arbitrary code execution via heap-based buffer overflow
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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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).
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Description OSIDB Bzimport 2026-10-06 20:22:26 UTC 
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.