CVE-2026-18790— Systerel S2OPC DeleteMonitoredItemsRequest state_machine.c out-of-bounds

CVSS 3.3 · Low EPSS 0.12% · P2 Updated Aug 05, 2026

Possible ATT&CK Techniques 2AI

T1203 · Exploitation for Client Execution T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 4

Vendor	Product	Version Range	Status
Systerel	S2OPC	`1.7.0`	affected
		`1.7.1`	affected
		`1.7.2`	affected
		`1.7.3`	affected

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I. Basic Information for CVE-2026-18790

Vulnerability Information

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Vulnerability Title

Systerel S2OPC DeleteMonitoredItemsRequest state_machine.c out-of-bounds

Source: CVE Program / CVE List V5

Vulnerability Description

A weakness has been identified in Systerel S2OPC up to 1.7.3. This affects the function LockedStaMac_ProcessMsg_DeleteMonitoredItemsResponse of the file src/ClientServer/frontend/client_wrapper/internal/state_machine.c of the component DeleteMonitoredItemsRequest Handler. This manipulation causes out-of-bounds read. The attack can only be executed locally. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Source: CVE Program / CVE List V5

Vulnerability Type

跨界内存读

Source: CVE Program / CVE List V5

Vulnerability Title

systerel S2OPC OPC UA Toolkit 缓冲区错误漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

systerel S2OPC OPC UA Toolkit是systerel组织的一款工业通信中间件工具包。 systerel S2OPC OPC UA Toolkit 1.7.3及之前版本存在缓冲区错误漏洞，该漏洞源于DeleteMonitoredItemsRequest Handler组件的src/ClientServer/frontend/client_wrapper/internal/state_machine.c文件中LockedStaMac_ProcessMsg_DeleteMonitored

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Systerel	S2OPC	1.7.0	`cpe:2.3:a:systerel:s2opc::::::::`

II. Public POCs for CVE-2026-18790

#	POC Description	Source Link	Shenlong Link

AI-Generated POCPremium

No public POC found.

III. Intelligence Information for CVE-2026-18790

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Proof of Concept for CVE-2026-18790 (1)

🔗 S2OPC 1.7.3 client wrapper `out-of-bounds read` in `DeleteMonitoredItemsResponse` result-count handling · Issue #13 · gff-cw/information Read full article issue-tracking

Other References for CVE-2026-18790 (1)

https://github.com/user-attachments/files/28907371/poc.zipexploit

https://www.cve.org/CVERecord?id=CVE-2026-18790

IV. Related Vulnerabilities

Same product: S2OPC

Same vendor: Systerel

Same weakness: CWE-125

V. Comments for CVE-2026-18790

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CVE-2026-18790— Systerel S2OPC DeleteMonitoredItemsRequest state_machine.c out-of-bounds

Possible ATT&CK Techniques 2AI

Affected Version Matrix 4

I. Basic Information for CVE-2026-18790

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-18790

III. Intelligence Information for CVE-2026-18790

Proof of Concept for CVE-2026-18790 (1)

Other References for CVE-2026-18790 (1)

IV. Related Vulnerabilities

V. Comments for CVE-2026-18790

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