CVE-2026-22258 is a high-severity vulnerability affecting OISF Suricata, a network IDS, IPS, and NSM engine. This vulnerability allows crafted DCERPC traffic to cause Suricata to expand a buffer without limits, leading to memory exhaustion and the process being killed. The issue has been reported for DCERPC over UDP, with indications that DCERPC over TCP and SMB may also be vulnerable. The default configuration for DCERPC/TCP limits stream depth to 1MiB, which should mitigate the risk. However, versions 8.0.3 and 7.0.14 contain patches to address the vulnerability.
Risk to organizations includes potential service disruptions due to memory exhaustion. While some workarounds exist, such as disabling the parser for DCERPC/UDP or adjusting the `stream.reassembly.depth` setting for DCERPC/TCP and SMB, these may not completely eliminate the risk. Organizations should evaluate their exposure and apply the latest patches promptly.
With a CVSS score of 7.5, this vulnerability falls within the high severity category, indicating a significant risk. Organizations utilizing Suricata should prioritize testing and deploying the updates to versions 8.0.3 or 7.0.14 to mitigate the vulnerability.
The urgency for defenders is high, as the potential for exploitation exists if the vulnerability is not addressed. Organizations must be vigilant and ensure that all systems running affected versions of Suricata are updated without delay.
Vulnerability Details
The official CVE description states: 'Suricata is a network IDS, IPS and NSM engine. Prior to versions 8.0.3 and 7.0.14, crafted DCERPC traffic can cause Suricata to expand a buffer w/o limits, leading to memory exhaustion and the process getting killed.' The vulnerability types associated with this issue are classified as CWE-400 (Uncontrolled Resource Consumption) and CWE-770 (Allocation of Resources Without Limits or Throttling).
The CVSS score for this vulnerability is 7.5, indicating a high severity level. The attack vector is classified as NETWORK, and the attack complexity is LOW, meaning that no special conditions are required for exploitation. Privileges required are NONE, and user interaction is not needed, heightening the risk.
The affected product is OISF Suricata, specifically versions prior to 8.0.3 and 7.0.14. The vulnerability was published on January 27, 2026, and last modified on January 30, 2026.
Technical Analysis
The root cause of this vulnerability stems from the handling of crafted DCERPC traffic, which can lead to unbounded buffer expansion. The attack vector is primarily network-based, allowing attackers to exploit the vulnerability remotely. The complexity of the attack is low, meaning it can be executed without advanced skills.
No privileges are required, and no user interaction is necessary, making this vulnerability particularly dangerous. The impact on availability is high, as memory exhaustion can cause the Suricata process to terminate, leading to potential service disruptions.
Risk & Impact Analysis
Organizations that deploy Suricata are at risk of service interruptions due to the memory exhaustion caused by this vulnerability. If exploited, it can lead to significant downtime, affecting network monitoring and security operations. The blast radius potential is considerable, as it can impact all instances of Suricata deployed across an organization.
The urgency assessment based on the CVSS score indicates that organizations should address this vulnerability in their priority patch cycle. Given the severity of the issue, it is imperative for organizations to take immediate action to mitigate risks.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of Suricata prior to 8.0.3 and 7.0.14 are affected by this vulnerability. Organizations should ensure that they are using patched versions to prevent exploitation.
Mitigation & Remediation
To mitigate this vulnerability, organizations should upgrade their installations of Suricata to versions 8.0.3 or 7.0.14. If immediate patching is not feasible, organizations can disable the parser for DCERPC/UDP or adjust the `stream.reassembly.depth` setting for DCERPC/TCP and SMB to limit the amount of data that can be buffered. However, imposing limits may lead to loss of visibility in SMB.
For further information on securing your systems, organizations may consider engaging in penetration testing to identify similar weaknesses.
Detection Guidance
Organizations should monitor their systems for logs indicating unusual memory usage patterns or crashes of the Suricata process. Behavioral anomalies in traffic patterns may also signal exploitation attempts.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-22258 lies in its demonstration of the risks associated with unbounded buffer management in network applications. Security teams should learn from this vulnerability to implement better resource management practices.
In the face of increasing network threats, organizations must reassess their security posture regularly. For more insights on maintaining a robust security framework, consider reviewing our penetration testing methodology and our vulnerability management program design.
Lastly, organizations should engage in cloud penetration testing to address security in their cloud environments.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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