Executive Summary

CVE-2026-31937 is a high-severity vulnerability in the DCERPC buffering mechanism of the Suricata network security monitoring tool. The issue is caused by an inefficient algorithmic implementation that leads to quadratic time complexity during buffering operations.

This inefficiency can be exploited remotely without any privileges or user interaction, causing significant performance degradation by forcing the system into its worst-case processing scenario.

The vulnerability affects Suricata versions prior to 7.0.15 and has been fixed in version 7.0.15 and later.

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Impact Analysis

This vulnerability can lead to a significant reduction in system availability due to resource exhaustion caused by the inefficient DCERPC buffering process.

An attacker can remotely trigger this issue without any privileges or user interaction, resulting in a denial-of-service (DoS) condition.

The vulnerability does not affect confidentiality or integrity but has a high impact on availability, potentially disrupting network intrusion detection and prevention capabilities.

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Detection Guidance

This vulnerability is related to inefficiency in the DCERPC buffering mechanism within Suricata, which can lead to performance degradation and denial of service. Detection involves identifying if your Suricata installation is running a vulnerable version prior to 7.0.15.

You can check the Suricata version installed on your system using the following command:

• suricata --build-info

If the version is earlier than 7.0.15, your system is vulnerable. Additionally, monitoring Suricata logs and system performance for signs of resource exhaustion or denial of service related to DCERPC traffic may help detect exploitation attempts.

As a workaround, you can disable the dcerpc parser in Suricata configuration to mitigate the issue temporarily.

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Mitigation Strategies

To mitigate this vulnerability immediately, upgrade Suricata to version 7.0.15 or later, where the issue has been patched.

If upgrading is not immediately possible, disable the dcerpc parser in Suricata configuration as a workaround to prevent the inefficient buffering mechanism from being triggered.

Monitoring system performance and Suricata logs for unusual resource consumption related to DCERPC traffic can also help in early detection and mitigation.

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Compliance Impact

This vulnerability in Suricata leads to a high impact on availability due to performance degradation and potential denial of service caused by resource exhaustion.

However, the vulnerability does not affect confidentiality or integrity of data.

Since common standards and regulations like GDPR and HIPAA emphasize the protection of confidentiality, integrity, and availability of data, this vulnerability primarily impacts the availability aspect.

Organizations relying on Suricata for network security monitoring may face availability disruptions, which could affect their compliance with availability requirements under these regulations.

No direct information is provided about specific compliance impacts or remediation guidance related to these standards.

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