CVE-2026-90782
5.3
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Systerel | S2OPC | 0 <= 1.7.3 | affected |
| Systerel | S2OPC | 8848f051eed069b107ae7cb16a346d6f6386a8f5 | unaffected |
Weaknesses
- CWE-476: NULL Pointer Dereference
References
- https://gitlab.com/systerel/S2OPC/-/issues/1815
- https://gitlab.com/systerel/S2OPC/-/commit/8848f051eed069b107ae7cb16a346d6f6386a8f5
- 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
- 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
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