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Suricata lua: excessive flow variable registration can bypass sandbox

CVSS 3.1 7.5 HIGHCheck source for fixed versionsKEV status unknown

cve-program · CVE-2026-45770

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-45770

Published

suricata

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "OISF",
                    "product": "suricata",
                    "versions": [
                        {
                            "version": ">= 8.0.0, < 8.0.5",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

ChangeIntel

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Sources read 14 Nov 23:34 UTC · 274 of 275 readable · 272 fully read · documentation 469/469 current