Executive Summary

CVE-2026-31932 is a high-severity vulnerability in the krb5 parser of the Suricata network security monitoring tool. It is caused by an inefficiency in the buffering algorithm, specifically a quadratic complexity issue, which means that certain crafted inputs can cause the system to perform a very large number of operations.

This inefficiency leads to significant performance degradation, making the system slow or unresponsive when processing these inputs. The vulnerability can be exploited remotely without requiring any privileges or user interaction.

The issue affects Suricata versions prior to 7.0.15 and 8.0.4 and has been patched in these versions.

Useful 0 Not Useful 0

Impact Analysis

This vulnerability can cause severe performance degradation in Suricata, potentially leading to denial of service conditions where the system becomes slow or unresponsive.

Since the vulnerability can be exploited remotely without any privileges or user interaction, attackers can trigger this performance issue over the network, impacting system availability.

The impact is on availability only, with no direct effect on confidentiality or integrity.

Useful 0 Not Useful 0

Detection Guidance

This vulnerability is related to inefficiency in the krb5 parser of Suricata, which can cause performance degradation when processing certain inputs. Detection involves monitoring Suricata's performance and logs for unusual degradation or resource consumption when handling Kerberos traffic.

A practical approach to detect the vulnerability is to check the Suricata version running on your system to see if it is prior to the patched versions 7.0.15 or 8.0.4.

• Check Suricata version: `suricata --build-info | grep 'Version'`
• Monitor Suricata logs for performance issues or errors related to the krb5 parser.
• Use system monitoring tools (e.g., `top`, `htop`) to observe CPU and memory usage spikes during Kerberos traffic processing.

Useful 0 Not Useful 0

Mitigation Strategies

The immediate mitigation step is to upgrade Suricata to version 7.0.15 or 8.0.4 or later, where the vulnerability has been patched.

If upgrading immediately is not possible, a recommended workaround is to disable the "krb5" parser in Suricata to prevent exploitation of the vulnerability.

Useful 0 Not Useful 0

Compliance Impact

The vulnerability in Suricata's krb5 parser leads to performance degradation and potential denial of service due to inefficient buffering, impacting system availability.

However, there is no information provided about any impact on confidentiality or integrity of data, which are critical factors for compliance with standards like GDPR or HIPAA.

Since the vulnerability does not affect confidentiality or integrity, but availability only, its direct effect on compliance with regulations that focus on data protection and privacy is unclear from the provided information.

Useful 0 Not Useful 0