Bug 2531647 (CVE-2026-45751)

Summary: CVE-2026-45751 suricata: Suricata: Denial of service via use-after-free in inspection-buffer helper
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
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 remote attacker could exploit a use-after-free vulnerability in the inspection-buffer helper. This occurs when a chained transform reallocates a buffer, leaving an inspection pointer referencing freed memory. This issue, triggered during specific network traffic processing with a particular rule, could lead to a denial of service.
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Description OSIDB Bzimport 2026-09-10 20:31:47 UTC 
Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to versions 7.0.16 and 8.0.5, Suricata's inspection-buffer helper could leave an inspection pointer referencing freed memory after a chained transform caused the backing buffer to be reallocated. The issue is reached during a specific network traffic processing, and requires a specific but not malicious rule. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, avoid rules that chain `dotprefix` transform after another one.