CVE-2026-90782: Systerel s2opc

Medium severity, CVSS 5.3. EPSS: 0.6% chance of exploitation in the next 30 days.

S2OPC through 1.7.3 contains a null pointer dereference in msg_subscription_publish_bs__alloc_notification_message_items() where a failed allocation for DataChangeNotification is overwritten by a successful allocation for EventNotificationList. Attackers can trigger heap allocation failures on sessions with both data-change and event notifications to cause the server process to terminate.

Affected products

• Systerel s2opc: up to and including 1.7.3

Published 2026-09-13. Last modified 2026-09-23.