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CVE-2026-45762: Suricata defrag: missing address-family check can lead to remote crash

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-10 · updated 2026-09-28
• Weakness: CWE-843

Description

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 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. This can lead to a remote packet-triggered crash and denial of service when Suricata performs the relevant defragmentation. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, if using Suricata as an IDS with AF_PACKET, enabling AF_PACKET's `defrag` option may prevent Suricata from seeing such fragmented packets.

Affected products

• OISF suricata: before 7.0.16; from 8.0.0 before 8.0.5 — fixed in 7.0.16, 8.0.5

How to fix

Upgrade to a fixed version: OISF suricata 7.0.16, 8.0.5. Check the vendor advisory for mitigations.

References

• https://forum.suricata.io/t/suricata-8-0-5-and-7-0-16-released/6315
• https://github.com/OISF/suricata/security/advisories/GHSA-gv2j-f6jv-3878
• https://redmine.openinfosecfoundation.org/issues/8510

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