CVE-2026-19259Public exploitNetwork attack vector

Client crash via unchecked MMS itemId offsets

Published Aug 8, 2026 · Updated Aug 8, 2026

Heap out-of-bounds read in MZ Automation libIEC61850 1.6.0 through 1.6.1 allows remote attackers to crash MMS client processes. MmsMapping_varAccessSpecToObjectReference assumes each response itemId has an LN$FC$... layout and reads fixed offsets past a lone dollar sign. The client must browse a dataset after connecting to a malicious MMS server, or a man-in-the-middle attacker must modify the response; the resulting process abort interrupts that client.

CVSS severity5.3
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap out-of-bounds read in MZ Automation libIEC61850 1.6.0 through 1.6.1 allows remote attackers to crash MMS client processes. MmsMapping_varAccessSpecToObjectReference assumes each response itemId has an LN$FC$... layout and reads fixed offsets past a lone dollar sign. The client must browse a dataset after connecting to a malicious MMS server, or a man-in-the-middle attacker must modify the response; the resulting process abort interrupts that client.

The record

CVE
CVE-2026-19259
Published
Aug 8, 2026
Updated
Aug 8, 2026
Vendor
MZ Automation GmbH
Product
libIEC61850
Classifications
CWE-122, CWE-119, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 8, 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

4.3VulDBAV:L/AC:L/Au:S/C:P/I:P/A:P
5.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
1.9VulDBCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

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-122Heap-based Buffer Overflow
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Endpoint Denial of Service: Application 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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