Bug 2531665 (CVE-2026-45761)

Summary: CVE-2026-45761 suricata: Suricata: Heap Buffer Overflow via Crafted Rule Loading
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Suricata, a network Intrusion Detection System (IDS), Intrusion Prevention System (IPS), and Network Security Monitoring (NSM) engine. A local attacker, by providing a specially crafted rule with mixed-case frame syntax, could trigger a heap buffer overflow. This vulnerability occurs during the loading of signatures, potentially leading to a denial of service.
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Description OSIDB Bzimport 2026-09-10 21:19:48 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, a crafted rule using mixed-case frame syntax could trigger a heap buffer overflow while Suricata is loading signatures. The issue is reached during rule parsing/loading rather than by network traffic alone. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, preprocess rules to check that frames are all lowercase and/or only load trusted rulesets.