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

Quick assessment

Affected
Systerel S2OPC
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

S2OPC 1.7.3 及之前版本中， 函数存在空指针解引用（Null Pointer Dereference）漏洞。该问题发生在为 DataChangeNotification 分配内存失败时，其结果被 EventNotificationList 的成功分配所覆盖。攻击者可以通过在同时启用了数据变更通知（data-change）和事件通知（event notifications）的会话中触发堆内存分配失败，从而导致服务器进程终止（崩溃）。

CVSS 5.3 · Medium
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I. Basic Information for CVE-2026-90782

Vulnerability Information
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Vulnerability Title
S2OPC through 1.7.3 NULL Pointer Dereference in alloc_notification_message_items()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Systerel S2OPC 0 ~ 1.7.3 -

II. Public POCs for CVE-2026-90782

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III. Intelligence Information for CVE-2026-90782

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Other References for CVE-2026-90782 (6)

IV. Related Vulnerabilities

Same product: S2OPC
Same vendor: Systerel
Same weakness: CWE-476

V. Comments for CVE-2026-90782

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