CVE-2026-45763: CWE-770: Allocation of Resources Without Limits or Throttling in OISF suricata
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.
AI Analysis
Technical Summary
Suricata, a network intrusion detection and prevention system, has a vulnerability (CVE-2026-45763) in versions 8.0.0 to before 8.0.5 where the Lua sandbox memory limit (`security.lua.max-bytes`) was not reliably enforced during Lua rule execution. This flaw allows certain Lua allocation patterns to bypass the intended memory restrictions, leading to uncontrolled resource allocation. The vulnerability only manifests if Lua rules are enabled and a vulnerable Lua script is loaded. The issue is addressed in Suricata version 8.0.5.
Potential Impact
The vulnerability can cause a denial of service by exhausting memory resources due to Lua scripts exceeding the sandbox memory limit. There is no impact on confidentiality or integrity reported. Exploitation requires enabling Lua rules and loading a specific Lua script that triggers the allocation issue.
Mitigation Recommendations
Upgrade Suricata to version 8.0.5 or later, where the issue is fixed. If upgrading is not immediately possible, disable Lua rule execution by setting `security.lua.allow-rules` to false unless Lua rules are explicitly required. This prevents the vulnerability from being triggered.
CVE-2026-45763: CWE-770: Allocation of Resources Without Limits or Throttling in OISF suricata
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.
CVSS v3.1
Score 5.9medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Suricata, a network intrusion detection and prevention system, has a vulnerability (CVE-2026-45763) in versions 8.0.0 to before 8.0.5 where the Lua sandbox memory limit (`security.lua.max-bytes`) was not reliably enforced during Lua rule execution. This flaw allows certain Lua allocation patterns to bypass the intended memory restrictions, leading to uncontrolled resource allocation. The vulnerability only manifests if Lua rules are enabled and a vulnerable Lua script is loaded. The issue is addressed in Suricata version 8.0.5.
Potential Impact
The vulnerability can cause a denial of service by exhausting memory resources due to Lua scripts exceeding the sandbox memory limit. There is no impact on confidentiality or integrity reported. Exploitation requires enabling Lua rules and loading a specific Lua script that triggers the allocation issue.
Mitigation Recommendations
Upgrade Suricata to version 8.0.5 or later, where the issue is fixed. If upgrading is not immediately possible, disable Lua rule execution by setting `security.lua.allow-rules` to false unless Lua rules are explicitly required. This prevents the vulnerability from being triggered.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-13T07:45:21.250Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6aa2b2bbacd9273b4929ce65
Added to database: 09/10/2026, 13:38:03 UTC
Last enriched: 09/10/2026, 13:52:46 UTC
Last updated: 09/10/2026, 17:00:16 UTC
Views: 6
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