What’s Vulnerable › Vulnerabilities
CVE-2026-106547: HDF5 heap buffer overflow in H5VM_array_fill via crafted fill-value metadata
- Severity: high (CVSS 8.5 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-06 · updated 2026-10-07
- Weakness: CWE-122
Description
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.
Affected products
- HDF5: from 1.10.0 before 2.2.0 — fixed in 2.2.0
How to fix
Upgrade to a fixed version: HDF5 2.2.0. Check the vendor advisory for mitigations.
References
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