CVE-2026-19025Public exploit

Application crash via mismatched dataset ranks

Published Aug 5, 2026 · Updated Aug 5, 2026

Divide-by-zero in The HDF Group HDF5 2.3.0 and earlier allows attackers to crash applications that read a crafted HDF5 file. H5O__layout_decode accepts stored chunk-layout dimensionality that differs from the dataspace rank, causing H5S__hyper_iter_get_seq_list to divide by zero. Processing attacker-supplied HDF5 content is required; the demonstrated path opens and reads the file through H5Dopen2 and H5Dread, including in h5repack.

CVSS severity6.8
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Divide-by-zero in The HDF Group HDF5 2.3.0 and earlier allows attackers to crash applications that read a crafted HDF5 file. H5O__layout_decode accepts stored chunk-layout dimensionality that differs from the dataspace rank, causing H5S__hyper_iter_get_seq_list to divide by zero. Processing attacker-supplied HDF5 content is required; the demonstrated path opens and reads the file through H5Dopen2 and H5Dread, including in h5repack.

The record

CVE
CVE-2026-19025
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
The HDF Group
Product
HDF5
Classifications
CWE-369, CAPEC-165, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 2.3.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The HDF Group · HDF5version=<= 2.3.0

Published CVSS scores

6.8The HDF GroupCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-369Divide By Zero
CAPEC-165File Manipulation
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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