CVE-2026-45751 OISF CVE debrief

Who should care

Network defenders and security teams using Suricata for network Intrusion Detection System, Intrusion Prevention System, and Network Security Monitoring should assess their exposure and prioritize updating to versions 7.0.16 or 8.0.5.

Why it matters

Defenders should care about CVE-2026-45751 because it affects Suricata, a widely used network security tool. The vulnerability could lead to denial of service and potential evasion of detection. Network defenders and security teams should assess their exposure, verify current versions and configurations, and prioritize updating to versions 7.0.16 or 8.0.5.

• Potential denial of service due to improper memory management
• Possible evasion of detection by malicious actors
• Need for verification of current Suricata versions and configurations
• Priority on updating Suricata to fixed versions

Technical summary

The vulnerability in Suricata's inspection-buffer helper could leave an inspection pointer referencing freed memory after a chained transform caused the backing buffer to be reallocated. This issue requires specific network traffic processing and a specific but not malicious rule. The affected product deployments should be reviewed for exposure, and owners should prioritize updating to versions 7.0.16 or 8.0.5. In the meantime, avoid using rules that chain the `dotprefix` transform after another one. The vulnerability could lead to denial of service and potential evasion of detection.

Defensive priority

Defenders should prioritize updating Suricata to versions 7.0.16 or 8.0.5. In the meantime, avoid using rules that chain the `dotprefix` transform after another one.

Recommended defensive actions

• Update Suricata to version 7.0.16 or 8.0.5
• Avoid using rules that chain the `dotprefix` transform after another one
• Review network traffic processing and rule configurations
• Confirm whether affected Suricata deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected versions. The vendor, OISF, has released fixed versions and provided workarounds.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.