What is the CVSS score of CVE-2026-22258?

CVE-2026-22258 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2026-22258?

Within 24 hours: Verify which systems run affected Suricata versions (pre-8.0.3 and pre-7.0.14) and assess criticality. Within 7 days: Deploy available patches to all Suricata instances; prioritize production IDS/IPS sensors and NSM deployments. Within 30 days: Validate patch deployment, confirm normal operation across all sensors, and document completion in change management systems.

Suricata CVE-2026-22258

HIGH

Uncontrolled Resource Consumption (CWE-400)

2026-01-27 security-advisories@github.com

Denial Of Service Suricata Suse Oisf

7.5

CVSS 3.1 · GitHub Advisory

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Craft malicious DCERPC packet
Delivery

Send over UDP to Suricata
Exploit

Parser expands buffer without limits
Execution

Memory exhaustion
Impact

Process termination

Vulnerability Assessment

Weakness	CWE CWE-400 OWASP Top 10:2025 A06:2025 - Insecure Design ASVS 5.0 V2 - Validation and Business Logic Resource consumption limits MITRE ATT&CK 1 technique across 1 tactic: Impact The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	DCERPC/UDP parser enabled in Suricata versions prior to 8.0.3 and 7.0.14. DCERPC/TCP vulnerable only when stream.reassembly.depth exceeds 1MiB. Attacker must reach network interface monitored by Suricata.
Impact	CVSS 7.5 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None. Exploitable via remote/network.
Exploit ScenarioDerived	A remote attacker could exploit this vulnerability to loss of visibility in SMB.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Uncontrolled buffer expansion in Suricata's DCERPC parser allows remote attackers to trigger unbounded memory allocation and cause denial of service by sending specially crafted DCERPC traffic. The vulnerability affects versions prior to 8.0.3 and 7.0.14 across DCERPC/UDP, DCERPC/TCP, and SMB protocols, with TCP being partially protected by default stream depth limits. Patches are available, and administrators can mitigate by disabling vulnerable parsers or configuring stream reassembly depth limits.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 7.5

RemediationAI

A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-400 (Uncontrolled Resource Consumption). Affects Suricata. 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. While reported for DCERPC over UDP, it is believed that DCERPC over TCP and SMB are also vulnerable. DCERPC/TCP in the default configuration should not be vulnerable as the default stream depth is limited to 1MiB. Versions 8.0.3 and 7.0.14 contain a patch. Some workarounds are avail

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

GitHub Advisory PRIMARY 7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SUSE HIGH

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Patch released

Jan 30, 2026 - 20:09 nvd

Patch available

CVE Published

Jan 27, 2026 - 17:16 nvd

HIGH 7.5

DescriptionGitHub Advisory

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. While reported for DCERPC over UDP, it is believed that DCERPC over TCP and SMB are also vulnerable. DCERPC/TCP in the default configuration should not be vulnerable as the default stream depth is limited to 1MiB. Versions 8.0.3 and 7.0.14 contain a patch. Some workarounds are available. For DCERPC/UDP, disable the parser. For DCERPC/TCP, the stream.reassembly.depth setting will limit the amount of data that can be buffered. For DCERPC/SMB, the stream.reassembly.depth can be used as well, but is set to unlimited by default. Imposing a limit here may lead to loss of visibility in SMB.

Executive ViewAI

Why It Matters

Suricata instances are vulnerable to denial-of-service attacks via malicious DCERPC traffic that exhausts server memory and crashes the process. Organizations relying on Suricata for network intrusion detection, prevention, or monitoring face potential service outages that could blind security operations and leave the network unmonitored during attacks.

Business Impact: High

Compensating Controls

Apply vendor patch. If immediate patching is delayed: implement network segmentation to restrict DCERPC traffic to Suricata sensors only where necessary, monitor Suricata process memory utilization and configure automated restart on memory threshold, and consider temporary traffic bypass rules to exclude DCERPC analysis if operationally feasible pending patch deployment.

Threat Intelligence Overview

EPSS Score

0.1%

Top 84% exploitable

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS Vendor

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.1%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)GitHub Advisory

cpe:2.3:a:oisf:suricata:*:*:*:*:*:*:*:*

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