CVE-2025-6818Public exploit

Local process crash via undersized object-header buffer

Published Jun 28, 2025 · Updated Jun 30, 2025

Heap-based buffer overflow in HDF5 1.14.6 allows local users to crash a process that opens a crafted HDF5 file. A self-referential object-header continuation message makes the library allocate an undersized internal buffer before encoding a message beyond its boundary. Exploitation requires local access or delivery of the file to an HDF5-consuming process, and the demonstrated consequence is an availability-only crash.

CVSS severity3.3
Low
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in HDF5 1.14.6 allows local users to crash a process that opens a crafted HDF5 file. A self-referential object-header continuation message makes the library allocate an undersized internal buffer before encoding a message beyond its boundary. Exploitation requires local access or delivery of the file to an HDF5-consuming process, and the demonstrated consequence is an availability-only crash.

The record

CVE
CVE-2025-6818
Published
Jun 28, 2025
Updated
Jun 30, 2025
Vendor
The HDF Group
Product
HDF5
Classifications
CWE-122, CWE-119
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-122Heap-based Buffer Overflow
CWE-119Memory Corruption

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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