CVE-2026-18790 Systerel S2OPC DeleteMonitoredItemsRequest state_machine.c out-of-bounds
A local attacker can trigger an out-of-bounds read in the S2OPC library, potentially causing information disclosure or denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18790?
CVE-2026-18790 is a medium-severity memory corruption vulnerability in Systerel S2OPC, published on 4 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-18790?
How do I fix CVE-2026-18790?
No fix has been published for CVE-2026-18790 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-18790 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-18790 exists.
Sources
Also known as GHSA-xq9j-r58r-r55p.