Platform
linux
Component
suricata
Fixed in
7.0.16
CVE-2026-31937 affects Suricata, a popular network intrusion detection, prevention, and network security monitoring engine. A vulnerability stemming from inefficient DCERPC buffering can lead to significant performance degradation, impacting the effectiveness of security monitoring. This issue affects versions of Suricata prior to 7.0.15 and has been resolved in version 7.0.15.
The primary impact of CVE-2026-31937 is a substantial performance degradation within Suricata deployments. This slowdown can manifest as increased latency in packet processing, higher CPU utilization, and reduced throughput. In environments with high network traffic, this performance hit can severely impact the engine’s ability to accurately detect and respond to malicious activity. The degradation is directly tied to the inefficient handling of DCERPC (Distributed Component Object Runtime Remote Procedure Call) traffic, a common protocol used in Windows networks. While not a direct security exploit allowing unauthorized access, the performance impact can effectively blind security teams to ongoing attacks by overwhelming the system’s resources.
CVE-2026-31937 is not directly exploitable in the sense of gaining unauthorized access. However, the performance degradation it causes can indirectly impact security posture. The vulnerability was publicly disclosed on 2026-04-02. There are no known public proof-of-concept exploits available at this time. The EPSS score is pending evaluation, indicating an unknown probability of exploitation. It is not currently listed on the CISA KEV catalog.
Exploit Status
EPSS
0.05% (16% percentile)
CISA SSVC
CVSS Vector
The primary mitigation for CVE-2026-31937 is to upgrade Suricata to version 7.0.15 or later. If an immediate upgrade is not feasible due to compatibility concerns or testing requirements, consider temporarily reducing the volume of DCERPC traffic processed by Suricata, if possible, by adjusting network segmentation or filtering rules. Monitor Suricata’s performance metrics (CPU usage, memory consumption, packet processing rate) closely to identify potential degradation. After upgrading, confirm the resolution by observing normal performance metrics and verifying that DCERPC traffic is handled efficiently.
Update Suricata to version 7.0.15 or higher. This version contains a fix for the inefficiency in DCERPC buffering that can cause performance degradation.
Vulnerability analysis and critical alerts directly to your inbox.
CVE-2026-31937 is a vulnerability in Suricata versions prior to 7.0.15 that causes performance degradation due to inefficient DCERPC buffering, impacting network IDS, IPS, and NSM functionality.
You are affected if you are running Suricata versions 7.0.15 or earlier. Check your Suricata version and upgrade if necessary.
Upgrade Suricata to version 7.0.15 or later to resolve the performance degradation issue. Consider temporary workarounds if immediate upgrade is not possible.
There are currently no known public exploits or active campaigns targeting CVE-2026-31937, but the performance impact can still degrade security monitoring.
Refer to the official Suricata security advisory for detailed information and updates regarding CVE-2026-31937: [https://suricata.io/security-advisories](https://suricata.io/security-advisories)
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