# Systerel S2OPC vulnerabilities

Source: https://junglewise.ai/threats/technologies/s2opc  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/s2opc.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 9 vulnerabilities in Systerel S2OPC: 0 in the last 7 days and 5 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-90782, was published on 13 September 2026. Nothing was published in the last eight weeks.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 5
- All time: 9 (1 critical, 0 exploited in the wild)

## About Systerel S2OPC

An open-source implementation of the OPC UA (IEC 62541) standard in C.

## Latest Systerel S2OPC vulnerabilities

- [CVE-2026-90782: S2OPC null pointer dereference in notification message allocation](https://junglewise.ai/threats/cve-2026-90782-s2opc-null-pointer-dereference-in-notification-message-allocation) (medium, CVSS 5.3, published 13 Sep 2026)
- [CVE-2026-82619: Systerel S2OPC use-after-free in monitored item event filter](https://junglewise.ai/threats/cve-2026-82619-systerel-s2opc-use-after-free-in-monitored-item-event-filter) (medium, CVSS 4.3, published 31 Aug 2026)
- [CVE-2026-82618: Systerel S2OPC out-of-bounds read in string array range writing](https://junglewise.ai/threats/cve-2026-82618-systerel-s2opc-out-of-bounds-read-in-string-array-range-writing) (medium, CVSS 4.3, published 31 Aug 2026)
- [CVE-2026-78049: Systerel S2OPC out-of-bounds read in AddNodes Service](https://junglewise.ai/threats/cve-2026-78049-systerel-s2opc-out-of-bounds-read-in-addnodes-service) (low, CVSS 3.7, published 22 Aug 2026)
- [CVE-2026-67868: Systerel S2OPC heap-based buffer overflow in EventFilter handling](https://junglewise.ai/threats/cve-2026-67868-systerel-s2opc-heap-based-buffer-overflow-in-eventfilter-handling) (critical, CVSS 9.8, published 17 Aug 2026)
- [CVE-2026-18790: Systerel S2OPC out-of-bounds read in DeleteMonitoredItemsResponse handler](https://junglewise.ai/threats/cve-2026-18790-systerel-s2opc-out-of-bounds-read-in-deletemonitoreditemsresponse) (low, CVSS 3.3, published 4 Aug 2026)
- [CVE-2026-18257: Systerel S2OPC Improper Certificate Validation in CycloneCrypto](https://junglewise.ai/threats/cve-2026-18257-systerel-s2opc-improper-certificate-validation-in-cyclonecrypto) (medium, CVSS 5.6, published 29 Jul 2026)
- [CVE-2026-9758: Systerel S2OPC Improper Certificate Validation in Trust List Check](https://junglewise.ai/threats/cve-2026-9758-systerel-s2opc-improper-certificate-validation-in-trust-list-check) (high, CVSS 7.3, published 10 Jun 2026)
- [CVE-2026-6899: Systerel S2OPC improper certificate revocation check in CycloneCrypto](https://junglewise.ai/threats/cve-2026-6899-systerel-s2opc-improper-certificate-revocation-check-in) (medium, CVSS 5.6, published 9 Jun 2026)

## Most severe Systerel S2OPC vulnerabilities

- [CVE-2026-67868: Systerel S2OPC heap-based buffer overflow in EventFilter handling](https://junglewise.ai/threats/cve-2026-67868-systerel-s2opc-heap-based-buffer-overflow-in-eventfilter-handling) (critical, CVSS 9.8, published 17 Aug 2026)
- [CVE-2026-9758: Systerel S2OPC Improper Certificate Validation in Trust List Check](https://junglewise.ai/threats/cve-2026-9758-systerel-s2opc-improper-certificate-validation-in-trust-list-check) (high, CVSS 7.3, published 10 Jun 2026)
- [CVE-2026-18257: Systerel S2OPC Improper Certificate Validation in CycloneCrypto](https://junglewise.ai/threats/cve-2026-18257-systerel-s2opc-improper-certificate-validation-in-cyclonecrypto) (medium, CVSS 5.6, published 29 Jul 2026)
- [CVE-2026-6899: Systerel S2OPC improper certificate revocation check in CycloneCrypto](https://junglewise.ai/threats/cve-2026-6899-systerel-s2opc-improper-certificate-revocation-check-in) (medium, CVSS 5.6, published 9 Jun 2026)
- [CVE-2026-90782: S2OPC null pointer dereference in notification message allocation](https://junglewise.ai/threats/cve-2026-90782-s2opc-null-pointer-dereference-in-notification-message-allocation) (medium, CVSS 5.3, published 13 Sep 2026)
- [CVE-2026-82619: Systerel S2OPC use-after-free in monitored item event filter](https://junglewise.ai/threats/cve-2026-82619-systerel-s2opc-use-after-free-in-monitored-item-event-filter) (medium, CVSS 4.3, published 31 Aug 2026)
- [CVE-2026-82618: Systerel S2OPC out-of-bounds read in string array range writing](https://junglewise.ai/threats/cve-2026-82618-systerel-s2opc-out-of-bounds-read-in-string-array-range-writing) (medium, CVSS 4.3, published 31 Aug 2026)
- [CVE-2026-78049: Systerel S2OPC out-of-bounds read in AddNodes Service](https://junglewise.ai/threats/cve-2026-78049-systerel-s2opc-out-of-bounds-read-in-addnodes-service) (low, CVSS 3.7, published 22 Aug 2026)
- [CVE-2026-18790: Systerel S2OPC out-of-bounds read in DeleteMonitoredItemsResponse handler](https://junglewise.ai/threats/cve-2026-18790-systerel-s2opc-out-of-bounds-read-in-deletemonitoreditemsresponse) (low, CVSS 3.3, published 4 Aug 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 2 | 1 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 2 | 0 | 0 |
| 7 Sep 2026 | 1 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Systerel S2OPC vulnerabilities", https://junglewise.ai/threats/technologies/s2opc, 9 November 2026.