Client crash via unchecked response result count
Published Aug 4, 2026 · Updated Aug 4, 2026
Out-of-bounds read in Systerel S2OPC 1.7.0 through 1.7.3 allows local users to crash client-wrapper applications. LockedStaMac_ProcessMsg_DeleteMonitoredItemsResponse uses server-controlled NoOfResults as a loop bound to index the saved MonitoredItemIds array without checking that the response and request counts match. The CNA describes local access as required, while the PoC demonstrates network-path reachability from a malicious server or man-in-the-middle attacker; the demonstrated consequence is a client-process abort.
Summary
What happened
Out-of-bounds read in Systerel S2OPC 1.7.0 through 1.7.3 allows local users to crash client-wrapper applications. LockedStaMac_ProcessMsg_DeleteMonitoredItemsResponse uses server-controlled NoOfResults as a loop bound to index the saved MonitoredItemIds array without checking that the response and request counts match. The CNA describes local access as required, while the PoC demonstrates network-path reachability from a malicious server or man-in-the-middle attacker; the demonstrated consequence is a client-process abort.
The record
- CVE
- CVE-2026-18790
- Published
- Aug 4, 2026
- Updated
- Aug 4, 2026
- Vendor
- Systerel
- Product
- S2OPC
- Classifications
- CWE-119, CWE-125, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 4, 2026CVE publishedPublication date reported by the CVE source.
- Aug 4, 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.
- Affected versionversion=1.7.0
- Affected versionversion=1.7.1
- Affected versionversion=1.7.2
- Affected versionversion=1.7.3
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
Public exploit references
- S2OPC DeleteMonitoredItemsResponse PoCfunctional · demonstrated
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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