Bug 2531671 (CVE-2026-45770)

Summary: CVE-2026-45770 suricata: Suricata: Lua rule can bypass sandbox or cause denial of service
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Suricata, a network Intrusion Detection System. A specially crafted Lua rule that registers an excessive number of flow variables can corrupt the Lua detection state. This could allow an attacker to bypass Suricata's restricted Lua sandbox, potentially leading to unauthorized actions. Additionally, the excessive registration of flow variables may cause Suricata to crash, resulting in a denial of service.
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Description OSIDB Bzimport 2026-09-10 21:51:37 UTC 
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.