High severity · published Sep 10, 2026
CVE-2026-45770
Suricata lua: excessive flow variable registration can bypass sandbox
7.5
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SU
suricata · OISF
>= 8.0.0, < 8.0.5 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45770
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45770
Release Notes
https://forum.suricata.io/t/suricata-8-0-5-and-7-0-16-released/6315
Third Party Advisory
https://github.com/OISF/suricata/security/advisories/GHSA-653j-cc95-vj4c
Permissions Required
https://redmine.openinfosecfoundation.org/issues/8556
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