CVE-2026-31932
Inefficient KRB5 Buffering in Suricata Causes Performance Degradation
Publication date: 2026-04-02
Last updated on: 2026-04-07
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| oisf | suricata | to 7.0.15 (exc) |
| oisf | suricata | From 8.0.0 (inc) to 8.0.4 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-407 | An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
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.
How can this vulnerability impact me? :
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.
How can this vulnerability be detected on my network or system? Can you suggest some commands?
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.
What immediate steps should I take to mitigate this vulnerability?
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.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
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.