# CVE-2026-90782

## Summary

- **CVE ID:** CVE-2026-90782
- **Severity:** MEDIUM
- **CVSS Score:** 6 (CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-476
- **Published:** Sep 13, 2026
- **Last Modified:** Sep 14, 2026

## 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 (0)
- Systerel — S2OPC (8848f051eed069b107ae7cb16a346d6f6386a8f5)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.32%
- **EPSS Percentile:** 25.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._