CVE-2026-45762 OISF CVE debrief

Who should care

Network defenders and administrators using Suricata as a network Intrusion Detection System, Intrusion Prevention System, or Network Security Monitoring engine should assess their exposure and prioritize updates to versions 7.0.16 or 8.0.5.

Why it matters

CVE-2026-45762 is a high-severity vulnerability in Suricata that can lead to a remote denial-of-service attack. Network defenders and administrators should prioritize updates to versions 7.0.16 or 8.0.5 to prevent potential attacks. The vulnerability's impact is supported by the CVE record and NVD entry, but further verification is needed to determine the full scope of affected systems and potential exploitation.

• Denial of service via remote packet-triggered crash
• Potential disruption of network security monitoring and intrusion detection capabilities
• Need for verification of Suricata version and exposure to crafted fragmented IPv4/IPv6 traffic
• Possible impact on incident response and network security operations

Technical summary

Suricata's IP defragmentation tracker lookup did not verify that an existing tracker used the same IP address family as the packet being processed. Under crafted fragmented IPv4/IPv6 traffic, an IPv6 fragment could be associated with an IPv4 defragmentation tracker, leading to a remote packet-triggered crash and denial of service. This issue affects Suricata versions prior to 7.0.16 and 8.0.5. The vulnerability can be mitigated by enabling AF_PACKET's defrag option if using Suricata as an IDS with AF_PACKET. Network defenders and administrators should assess their exposure and prioritize updates to versions 7.0.16 or 8.0.5.

Defensive priority

Defenders should prioritize updating Suricata to versions 7.0.16 or 8.0.5 to prevent potential denial-of-service attacks. If immediate updates are not feasible, enabling AF_PACKET's defrag option may help mitigate the issue.

Recommended defensive actions

• Update Suricata to version 7.0.16 or 8.0.5
• Enable AF_PACKET's defrag option if using Suricata as an IDS with AF_PACKET
• Confirm whether affected product 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.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• 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 impact on Suricata's IP defragmentation tracker lookup. However, the corpus does not establish versions, exploitation, impact, or remediation beyond the provided information.

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.