CVE-2025-6817Public exploit

Process crash via unchecked metadata allocation size

Published Jun 28, 2025 · Updated Jun 30, 2025

Resource consumption in H5C__load_entry in The HDF Group HDF5 1.14.6 allows local users to crash a parsing process via a crafted HDF5 file. The metadata-cache loader accepts a malformed raw header-continuation size and passes the resulting oversized allocation request to malloc without rejecting it. A local user must cause an application linked to HDF5 to open the file; the demonstrated result is an AddressSanitizer abort, not data disclosure or code execution.

CVSS severity3.3
Low
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource consumption in H5C__load_entry in The HDF Group HDF5 1.14.6 allows local users to crash a parsing process via a crafted HDF5 file. The metadata-cache loader accepts a malformed raw header-continuation size and passes the resulting oversized allocation request to malloc without rejecting it. A local user must cause an application linked to HDF5 to open the file; the demonstrated result is an AddressSanitizer abort, not data disclosure or code execution.

The record

CVE
CVE-2025-6817
Published
Jun 28, 2025
Updated
Jun 30, 2025
Vendor
The HDF Group
Product
HDF5
Classifications
CWE-400, CWE-404, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 28, 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 privilegesauthenticated

What is affected?

The HDF Group · HDF5version=1.14.6

Published CVSS scores

1.9UbuntuCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
3.3UbuntuCVSS: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Resource Consumption
CWE-404Denial of Service
T1499Endpoint Denial of Service

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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