CVE-2026-18582Public exploitNetwork attack vector

Remote server crash via oversized RptID invalid free

Published Aug 3, 2026 · Updated Aug 3, 2026

Invalid free in MZ Automation libIEC61850 1.6.0 through 1.6.1 allows remote attackers to crash MMS servers via an oversized RptID. The report sender wraps rptIdBuf, a 130-byte stack array, in a temporary MmsValue; MmsValue_setVisibleString frees that stack pointer when the stored RptID exceeds 129 bytes. Unauthenticated MMS access is sufficient: the attacker writes the oversized RptID and triggers reporting with GI, aborting the server process without demonstrated code execution.

CVSS severity5.3
Medium
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Invalid free in MZ Automation libIEC61850 1.6.0 through 1.6.1 allows remote attackers to crash MMS servers via an oversized RptID. The report sender wraps rptIdBuf, a 130-byte stack array, in a temporary MmsValue; MmsValue_setVisibleString frees that stack pointer when the stored RptID exceeds 129 bytes. Unauthenticated MMS access is sufficient: the attacker writes the oversized RptID and triggers reporting with GI, aborting the server process without demonstrated code execution.

The record

CVE
CVE-2026-18582
Published
Aug 3, 2026
Updated
Aug 3, 2026
Vendor
MZ Automation GmbH
Product
libIEC61850
Classifications
CWE-590, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=1.6.0
  2. Affected versionversion=1.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MZ Automation GmbH · libIEC61850version=1.6.0; version=1.6.1

Published CVSS scores

5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
5.0VulDBAV:N/AC:L/Au:N/C:N/I:N/A:P
5.3VulDBCVSS: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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-590Free of Memory not on the Heap
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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