What is the CVSS score of CVE-2026-22264?

CVE-2026-22264 has a CVSS 3.1 base score of 7.4 (High). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2026-22264?

Within 24 hours: Verify Suricata version across all deployed instances and identify systems running versions prior to 8.0.3 or 7.0.14. Within 7 days: Apply vendor patches to all affected Suricata installations, prioritizing production IDS/IPS systems. Within 30 days: Validate patch deployment through testing and update asset inventory to confirm all systems are current.

Suricata CVE-2026-22264

HIGH

Use After Free (CWE-416)

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

Use After Free Integer Overflow Suricata Suse Oisf

7.4

CVSS 3.1 · GitHub Advisory

View

Attack ChainAIDerived

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

Access

Craft network packet matching multiple signatures
Delivery

Trigger excessive alert generation
Exploit

Cause unsigned integer overflow
Execution

Heap use-after-free condition
Impact

Integrity/availability compromise

Vulnerability Assessment

Weakness	CWE CWE-416 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Memory lifecycle management MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation 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	Suricata versions before 8.0.3 (v8.x) or 7.0.14 (v7.x) with 65536+ signatures capable of matching the same packet. Requires untrusted or adversary-controlled ruleset deployment.
Impact	CVSS 7.4 (HIGH). Attack vector: Network. Complexity: High. Privileges required: None. User interaction: None. Exploitable via remote/network.
Exploit ScenarioDerived	A remote attacker could exploit this vulnerability to a heap use-after-free condition when generating excessive amounts of alerts for.

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

Heap use-after-free in Suricata prior to versions 8.0.3 and 7.0.14 can be triggered via integer overflow when processing packets that generate excessive alert conditions, allowing an attacker to crash the IDS/IPS engine or potentially achieve code execution. Affected deployments using large rulesets are at risk when processing malicious or crafted network traffic designed to trigger simultaneous signature matches. Patches are available for both affected versions.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 7.4

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-416 (Use After Free). Affects Suricata. Suricata is a network IDS, IPS and NSM engine. Prior to version 8.0.3 and 7.0.14, an unsigned integer overflow can lead to a heap use-after-free condition when generating excessive amounts of alerts for a single packet. Versions 8.0.3 and 7.0.14 contain a patch. As a workaround, do not run untrusted rulesets or run with less than 65536 signatures that can match on the same packet.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

GitHub Advisory PRIMARY 7.4 HIGH

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

SUSE HIGH

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

High

Lifecycle Timeline

Patch released

Jan 29, 2026 - 20:58 nvd

Patch available

CVE Published

Jan 27, 2026 - 19:16 nvd

HIGH 7.4

DescriptionGitHub Advisory

Suricata is a network IDS, IPS and NSM engine. Prior to version 8.0.3 and 7.0.14, an unsigned integer overflow can lead to a heap use-after-free condition when generating excessive amounts of alerts for a single packet. Versions 8.0.3 and 7.0.14 contain a patch. As a workaround, do not run untrusted rulesets or run with less than 65536 signatures that can match on the same packet.

Executive ViewAI

Why It Matters

A high-severity vulnerability in Suricata versions prior to 8.0.3 and 7.0.14 could allow attackers to crash or compromise network monitoring systems through specially crafted packets that generate excessive alerts. Organizations running affected Suricata deployments face potential loss of network visibility and intrusion detection capabilities during active exploitation.

Business Impact: High

Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score

0.1%

Top 81% 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

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +37

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Use After Free HIGH

Use-after-free vulnerabilities occur when a program continues to access memory through a pointer after that memory has been deallocated.

Integer Overflow MEDIUM

Integer overflow occurs when an arithmetic operation produces a result that exceeds the maximum value a given integer type can store.

Affected Products (CPE)GitHub Advisory

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

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