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CVE.org (no NVD analysis yet)· CNA HDFG

CVE-2026-106547: HDF5 heap buffer overflow in H5VM_array_fill via crafted fill-value metadata

Noroxi assessment

Priority: Monitor (action score 34/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.16% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. No special conditions are required; it is repeatable.
  • Fixed version: The HDF Group HDF5 2.2.0; azl3 hdf5 1.14.6-4 on Azure Linux 3.0 1.14.6-5.

Low priority for now. Upgrade to The HDF Group HDF5 2.2.0; azl3 hdf5 1.14.6-4 on Azure Linux 3.0 1.14.6-5 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 8.5 · v4.0—No exploit Fix available
Published
Oct 6, 2026
Updated
Oct 7, 2026
EPSS
0.1% · 5th percentile

Report tools

JSON

Action score

34

Monitor

Low priority for now.

CVSS
34 / 40 · 8.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · HDFG
8.5
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-106547

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (HDFG). Independent of NVD's CPE analysis and usually ahead of it.

  • The HDF Group HDF5

    • 1.10.0 and later · before 2.2.0affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12hdf5from 0—
Red Hat:hummingbird:1hdf5before 0:2.2.0-0.1.2.hum10:2.2.0-0.1.2.hum1
Red Hat:hummingbird:1hdf5-develbefore 0:2.2.0-0.1.2.hum10:2.2.0-0.1.2.hum1
Red Hat:hummingbird:1hdf5-mpichbefore 0:2.2.0-0.1.2.hum10:2.2.0-0.1.2.hum1
Red Hat:hummingbird:1hdf5-mpich-develbefore 0:2.2.0-0.1.2.hum10:2.2.0-0.1.2.hum1
Red Hat:hummingbird:1hdf5-mpich-staticbefore 0:2.2.0-0.1.2.hum10:2.2.0-0.1.2.hum1
Red Hat:hummingbird:1hdf5-openmpibefore 0:2.2.0-0.1.2.hum10:2.2.0-0.1.2.hum1
Red Hat:hummingbird:1hdf5-openmpi-develbefore 0:2.2.0-0.1.2.hum10:2.2.0-0.1.2.hum1
Red Hat:hummingbird:1hdf5-openmpi-staticbefore 0:2.2.0-0.1.2.hum10:2.2.0-0.1.2.hum1
Red Hat:hummingbird:1hdf5-staticbefore 0:2.2.0-0.1.2.hum10:2.2.0-0.1.2.hum1
Red Hat:hummingbird:1java-hdf5before 0:2.2.0-0.1.2.hum10:2.2.0-0.1.2.hum1

Same product

the hdf group: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-19024HDF5 H5Pget_fill_value NULL Pointer Dereference via Malformed Fill Value Message
    32Monitor
  • CVE-2026-19029HDF5 scale-offset filter heap buffer over-read via crafted chunk
    27Monitor
  • CVE-2026-19028HDF5 integer underflow in Fletcher32 filter leads to massive out-of-bounds read
    27Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-19027Aug 6, 2026 · HDF5 out-of-bounds heap read in N-Bit filter decompression
    27Monitor
  • ← EarlierCVE-2026-92627Sep 16, 2026 · Heap Use-After-Free in H5T__conv_f_f
    18Monitor
  • Later →CVE-2026-120689Nov 2, 2026 · Uncontrolled Recursion in HDF5 H5B__iterate_helper() via Crafted File
    17Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
The HDF Group HDF52.2.0Vendor (CNA)
azl3 hdf5 1.14.6-4 on Azure Linux 3.01.14.6-5 · Release NotesMicrosoft (MSRC)
red hat:hdf50:2.2.0-0.1.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:hdf5-devel0:2.2.0-0.1.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:hdf5-mpich0:2.2.0-0.1.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:hdf5-mpich-devel0:2.2.0-0.1.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:hdf5-mpich-static0:2.2.0-0.1.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:hdf5-openmpi0:2.2.0-0.1.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:hdf5-openmpi-devel0:2.2.0-0.1.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:hdf5-openmpi-static0:2.2.0-0.1.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:hdf5-static0:2.2.0-0.1.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:java-hdf50:2.2.0-0.1.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 7, 2026+32 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
P
Scope
X

Weakness class (CWE)

CWE-122 · Heap-based Buffer Overflow

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → none
  2. Exploit maturity— → none
  3. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records