CVE-2026-17572

Crash via unchecked SOHM message count

Published Jul 27, 2026 · Updated Jul 27, 2026

Heap buffer overflow in HDF5 through 2.1.1 allows attackers to crash a file-processing application via a crafted HDF5 file. H5SM__cache_list_deserialize trusts num_messages from the on-disk SOHM list header even when it exceeds list_max, then iterates past the heap array while H5SM__cache_list_verify_chksum reads beyond the image buffer. Reachability requires an application or user to parse the malformed file; the documented consequence is a process crash, not code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in HDF5 through 2.1.1 allows attackers to crash a file-processing application via a crafted HDF5 file. H5SM__cache_list_deserialize trusts num_messages from the on-disk SOHM list header even when it exceeds list_max, then iterates past the heap array while H5SM__cache_list_verify_chksum reads beyond the image buffer. Reachability requires an application or user to parse the malformed file; the documented consequence is a process crash, not code execution.

The record

CVE
CVE-2026-17572
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
The HDF Group
Product
HDF5
Classifications
CWE-125, CWE-787, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 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=<= 2.1.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The HDF Group · HDF5version=<= 2.1.1

Published CVSS scores

5.5HDFGCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:H/SC:N/SI:L/SA:H/E:U

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CWE-787Out-of-bounds Write
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

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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