---
id: CVE-2026-45770
title: >-
  Suricata is a network Intrusion Detection System, Intrusion Prevention System
  and Network Security Monitoring engine
summary: >-
  Suricata is a network Intrusion Detection System, Intrusion Prevention System
  and Network Security Monitoring engine. Starting in version 8.0.0 and prior to
  version 8.0.5, a Lua rule that registers too many flow variables can corrupt
  Lua…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-693
  - CWE-787
vendor: oisf
product: suricata
affected:
  - 'suricata >= 8.0.0, < 8.0.5'
patched:
  - suricata 8.0.5
published: '2026-09-10'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T18:28:14.913'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-45770'
references:
  - url: 'https://forum.suricata.io/t/suricata-8-0-5-and-7-0-16-released/6315'
    label: security-advisories@github.com
  - url: 'https://github.com/OISF/suricata/security/advisories/GHSA-653j-cc95-vj4c'
    label: security-advisories@github.com
  - url: 'https://redmine.openinfosecfoundation.org/issues/8556'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
epss: 0.0048
epssPercentile: 0.38827
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-11T14:36:27.298514Z'
ingestedAt: '2026-09-11T18:53:56.462Z'
---

## Overview

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Starting in version 8.0.0 and prior to version 8.0.5, a Lua rule that registers too many flow variables can corrupt Lua detection state and may bypass Suricata's restricted Lua sandbox. This requires an affected Lua script/rule to be loaded. Excessive flow variables being registered may also cause Suricata to crash. Version 8.0.5 contains a fix. As a workaround, disable `security.lua.allow-rules` unless Lua rules are required.

## Affected

- `suricata >= 8.0.0, < 8.0.5`

## Remediation

Upgrade past the affected range:

- `suricata 8.0.5`