CVE-2026-82619
Received Received - Intake

Use After Free in Systerel S2OPC

Vulnerability report for CVE-2026-82619, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-08-31

Last updated on: 2026-08-31

Assigner: VulDB

Description

A vulnerability was identified in Systerel S2OPC up to 1.7.3. The impacted element is the function monitored_item_event_filter_treatment_bs__init_event_filter_ctx_and_result of the file src/ClientServer/services/bgenc/subscription_mgr.c. Such manipulation of the argument EventFilter leads to use after free. The attack may be performed from remote. The exploit is publicly available and might be used. The name of the patch is a4cee16a851b971be447a6ed531173702c722b99. It is best practice to apply a patch to resolve this issue.

CVSS Scores

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Meta Information

Published
2026-08-31
Last Modified
2026-08-31
Generated
2026-08-31
AI Q&A
2026-08-31
EPSS Evaluated
N/A
NVD
EUVD

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
systerel s2opc to 1.7.3 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-119 The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

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Executive Summary

CVE-2026-82619 is a use-after-free vulnerability in Systerel S2OPC up to version 1.7.3. It occurs in the function monitored_item_event_filter_treatment_bs__init_event_filter_ctx_and_result when processing the EventFilter argument. A remote attacker can exploit this by sending a crafted request with multiple event-filter modifications for the same monitored item, leading to memory corruption or server crashes.

Detection Guidance

Detecting this vulnerability requires monitoring for heap-use-after-free events in S2OPC servers. Check S2OPC logs for crashes or memory corruption errors during ModifyMonitoredItemsRequest processing. Use tools like Valgrind or AddressSanitizer to detect heap corruption when running the S2OPC server with suspicious client requests.

Impact Analysis

This vulnerability allows remote attackers to cause denial of service, memory corruption, or server process termination. It requires basic client capabilities but no special privileges. Exploitation could disrupt OPC UA server operations, leading to service unavailability or potential data integrity issues.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR or HIPAA as it is a technical software flaw in S2OPC. However, if exploited, it could lead to denial of service or memory corruption, potentially disrupting systems handling sensitive data. Compliance may be indirectly impacted if such disruptions affect data availability or integrity.

Mitigation Strategies

Apply the patch a4cee16a851b971be447a6ed531173702c722b99 immediately. Update S2OPC to version 1.7.4 or later. Restrict network access to OPC UA servers to trusted clients only. Monitor server logs for signs of exploitation attempts targeting ModifyMonitoredItemsRequest handling.

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