CVE-2026-68908Public exploitNetwork attack vectorHinoki check available

Server crash via stack-backed report identifier free

Published Oct 16, 2026 · Updated Oct 16, 2026

Invalid free in libIEC61850 before 1.6.2 allows remote attackers to crash the MMS server via an oversized report identifier. Reporting_RCBWriteAccessHandler accepts RptID values longer than 129 bytes; sendNextReportEntrySegment then passes stack-backed rptIdBuf storage to MmsValue_setVisibleString, whose resize path frees it. Exploitation requires access to writable report-control-block fields and report generation through general interrogation (GI); the demonstrated consequence is a server crash, not code execution.

CVSS severity5.3
Medium
EPSS probability0.45%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Invalid free in libIEC61850 before 1.6.2 allows remote attackers to crash the MMS server via an oversized report identifier. Reporting_RCBWriteAccessHandler accepts RptID values longer than 129 bytes; sendNextReportEntrySegment then passes stack-backed rptIdBuf storage to MmsValue_setVisibleString, whose resize path frees it. Exploitation requires access to writable report-control-block fields and report generation through general interrogation (GI); the demonstrated consequence is a server crash, not code execution.

The record

CVE
CVE-2026-68908
Published
Oct 16, 2026
Updated
Oct 16, 2026
Vendor
MZ Automation GmbH
Product
libIEC61850
Classifications
CWE-763, CWE-664, CWE-590, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 16, 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=< 1.6.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MZ Automation GmbH · libIEC61850version=< 1.6.2

Published CVSS scores

5.3MZ Automation GmbHCVSS:3.1/AV:N/AC:L/PR:N/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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-763Release of Invalid Pointer or Reference
CWE-664Improper Control of a Resource Through its Lifetime
CWE-590Free of Memory not on the Heap
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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