CVE-2026-45763 Suricata lua: sandbox allocation limit not enforced for new allocations
Attackers can cause denial of service in Suricata by exceeding Lua sandbox memory limits when Lua rules are enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45763?
CVE-2026-45763 is a medium-severity denial of service vulnerability in Oisf Suricata, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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, when Lua rule execution is enabled, the Lua sandbox memory limit was not consistently enforced for new allocations. Certain Lua allocation patterns could exceed `security.lua.max-bytes` without triggering the intended memory limit, making the configured sandbox limit unreliable. This requires Lua rules to be enabled and an affected Lua script/rule to be loaded. Version 8.0.5 contains a fix. As a workaround, disable `security.lua.allow-rules` unless Lua rules are required.
Weakness: CWE-770
Which versions are affected by CVE-2026-45763?
It affects 1 product.
Products include Oisf Suricata.
How do I fix CVE-2026-45763?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-45763 being exploited?
There is no known exploitation of CVE-2026-45763 in the wild and no public exploit code.
Other vulnerabilities in Oisf Suricata
Sources
Also known as DEBIAN-CVE-2026-45763, GHSA-9h43-frr8-xx6m, UBUNTU-CVE-2026-45763.