CVE-2025-6858Public exploit

Application crash via zero-sized continuation chunk

Published Jun 29, 2025 · Updated Jun 30, 2025

NULL pointer dereference in HDF5 1.14.6 allows local users to crash applications that open a crafted HDF5 file. H5O__cont_decode accepts a zero continuation-chunk size from an object-header continuation message, leaving cache state that H5C__flush_single_entry dereferences during H5Fopen. Local users need the ability to supply the file, and the demonstrated impact is process termination without data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in HDF5 1.14.6 allows local users to crash applications that open a crafted HDF5 file. H5O__cont_decode accepts a zero continuation-chunk size from an object-header continuation message, leaving cache state that H5C__flush_single_entry dereferences during H5Fopen. Local users need the ability to supply the file, and the demonstrated impact is process termination without data disclosure or modification.

The record

CVE
CVE-2025-6858
Published
Jun 29, 2025
Updated
Jun 30, 2025
Vendor
The HDF Group
Product
HDF5
Classifications
CWE-476, CWE-404, T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jun 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 30, 2025Record 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=1.14.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The HDF Group · HDF5version=1.14.6

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
1.7VulDB CNAAV:L/AC:L/Au:S/C:N/I:N/A:P
3.3VulDB CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
CWE-404Improper Resource Shutdown or Release
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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