What’s Vulnerable › Vulnerabilities

CVE-2026-90782: S2OPC through 1.7.3 NULL Pointer Dereference in alloc_notification_message_items()

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-13 · updated 2026-09-23
• Weakness: CWE-476

Description

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: through 1.7.3

References

• https://gitlab.com/systerel/S2OPC
• https://gitlab.com/systerel/S2OPC/-/blob/S2OPC_Toolkit_1.7.3/src/ClientServer/services/b2c/msg_subscription_publish_bs.c#L106-L147
• https://gitlab.com/systerel/S2OPC/-/commit/8848f051eed069b107ae7cb16a346d6f6386a8f5
• https://gitlab.com/systerel/S2OPC/-/issues/1815
• https://gitlab.com/systerel/S2OPC/-/merge_requests/1862
• https://www.vulncheck.com/advisories/s2opc-through-1.7.3-null-pointer-dereference-in-alloc-notification-message-items
• https://gitlab.com/systerel/S2OPC/-/issues/1815

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