Vulnerability · Published Sep 13, 2026 · Assigned by VulnCheck

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

Medium 5.3

In plain English

A medium-severity null pointer dereference in S2OPC from Systerel. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.6%top 52.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack tooling1Public PoC

Official 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 (as reported)

Vendor	Product	Versions
Systerel	S2OPC	0 – through 1.7.3

Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

References

GitLab issue 1815 issue-tracking
Patch Commit patch
Status clobbering and NULL dereference at S2OPC_Toolkit_1.7.3 technical-description
https://gitlab.com/systerel/S2OPC product
Merge request !1862 patch
VulnCheck Advisory: S2OPC through 1.7.3 NULL Pointer Dereference in alloc_notification_message_items() third-party-advisory