CVE-2026-106547
HDF5 heap buffer overflow in H5VM_array_fill via crafted fill-value metadata
The HDF Group HDF5
CVSS
8.5HighExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.16%Chance of exploitation activity in the next 30 days, higher than 5% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
- 2.2.0HDF5CVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
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.
Text from CVE List
Affected versions 1
- HDF5affected: 1.10.0 before 2.2.0CVE List