Bug 2532141 (CVE-2026-45768)

Summary: CVE-2026-45768 suricata: Suricata: Denial of Service via unbounded LDAP responses
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
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, Intrusion Prevention System, and Network Security Monitoring engine. The LDAP (Lightweight Directory Access Protocol) transaction state could store an unbounded number of responses. A remote attacker could send crafted UDP (User Datagram Protocol) traffic, causing Suricata to consume excessive memory. This could lead to a denial of service, making the system unavailable.
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Description OSIDB Bzimport 2026-09-11 20:54:22 UTC 
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, LDAP transaction state could store an unbounded number of responses. Because LDAP can be processed over UDP, crafted traffic may cause Suricata to consume excessive memory, potentially resulting in denial of service. Version 8.0.5 contains a fix. As a workaround, disable LDAP application-layer parsing where it is not required. Alternatively, use a rule like `alert ldap any any -> any any (sid: 1; ldap.responses.count: >1024; bypass;)`.