NULL pointer dereference in Systerel S2opc
CVE-2026-90782
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- gitlab.com/systerel/S2OPC/-/issues/1815 (issue-tracking)
- gitlab.com/systerel/S2OPC/-/commit/8848f051eed069b107ae7cb16a346d6f6386a8f5 (patch)
- gitlab.com/systerel/S2OPC/-/blob/S2OPC_Toolkit_1.7.3/src/ClientServer/services/… (technical-description)
- gitlab.com/systerel/S2OPC (product)
- gitlab.com/systerel/S2OPC/-/merge_requests/1862 (patch)
- www.vulncheck.com/advisories/s2opc-through-1.7.3-null-pointer-dereference-in-al… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-90782?
- CVE-2026-90782 is a medium-severity vulnerability in Systerel S2opc, classified under NULL Pointer Dereference. CVSS score: 5.3/10. Published 2026-09-13.
- How severe is CVE-2026-90782?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2026-90782 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.