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Fencer Vulns
high 8.5

CVE-2026-106547 json

HDF5 heap buffer overflow in H5VM_array_fill via crafted fill-value metadata

published 2026-10-06 33 d ago modified 2026-10-07 33 d ago also EUVD-2026-93991

cvss
8.5
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 5%
public exploits
0
none known

Summary

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.

Patch / fix

  • The HDF Group HDF5 2.2.0
  • hdf5 hummingbird 1 2.2.0-0.1.2.hum1
  • java-hdf5 hummingbird 1 2.2.0-0.1.2.hum1
  • hdf5-mpich hummingbird 1 2.2.0-0.1.2.hum1
  • hdf5-openmpi hummingbird 1 2.2.0-0.1.2.hum1

red hat advisories RHSA-2026:73539

  • hdf5 Azure Linux 3.0 1.14.6-6

azure linux advisories AZL-106679

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-106547 updated cvss 7.8

hdf5: hdf5: Arbitrary code execution via heap-based buffer overflow

  • Red Hat Hardened Images hdf5 2.2.0-0.1.2.hum1, java-hdf5 2.2.0-0.1.2.hum1, hdf5-mpich 2.2.0-0.1.2.hum1, hdf5-openmpi 2.2.0-0.1.2.hum1
    fixed: vendor fix RHSA-2026:73539

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
33 d ago

Exploit prediction

0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.5 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA 4.0 8.5 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • The HDF Group HDF5

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.