Medium severity · published Aug 8, 2026
CVE-2026-19259
MZ Automation libiec61850 MMS Protocol Workflow iec61850_common.c MmsMapping_varAccessSpecToObjectReference heap-based overflow
5.3
CVSS
0.2%
EPSS
No
On KEV
Description
A vulnerability has been found in MZ Automation libiec61850 up to 1.6.1. The affected element is the function MmsMapping_varAccessSpecToObjectReference of the file src/iec61850/common/iec61850_common.c of the component MMS Protocol Workflow. Such manipulation of the argument GetNamedVariableListAttributesResponse.itemId leads to heap-based buffer overflow. The attack must be carried out locally. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 7% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libiec61850 · MZ Automation
1.6.0; 1.6.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-19259
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-19259
github.com
https://github.com/mz-automation/libiec61850/issues/599
github.com
https://github.com/user-attachments/files/29190426/PoC.zip
vuldb.com
https://vuldb.com/cve/CVE-2026-19259
vuldb.com
https://vuldb.com/submit/865176
vuldb.com
https://vuldb.com/vuln/387009
vuldb.com
https://vuldb.com/vuln/387009/cti
More from libiec61850
9.8
CVE-2024-45970
Multiple Buffer overflows in the MMS Client in MZ Automation LibIEC61850 before commit ac925fae8e281ac6defcd630e9dd756264e9c5bc allow a malicious server to cause a stack-based…
9.8
CVE-2024-45971
Multiple Buffer overflows in the MMS Client in MZ Automation LibIEC61850 before commit 1f52be9ddeae00e69cd43e4cac3cb4f0c880c4f0 allow a malicious server to cause a stack-based…
9.8
CVE-2022-2972
MZ Automation's libIEC61850 (versions 1.4 and prior; version 1.5 prior to commit a3b04b7bc4872a5a39e5de3fdc5fbde52c09e10e) is vulnerable to a stack-based buffer overflow, which…
9.8
CVE-2022-2970
MZ Automation's libIEC61850 (versions 1.4 and prior; version 1.5 prior to commit a3b04b7bc4872a5a39e5de3fdc5fbde52c09e10e) does not sanitize input before memcpy is used, which…
9.8
CVE-2020-15158
In libIEC61850 before version 1.4.3, when a message with COTP message length field with value < 4 is received an integer underflow will happen leading to heap buffer overflow