Executive brief
Suricata is a network intrusion detection and prevention system used to monitor and protect network traffic. The vulnerability causes Suricata to deadlock when processing certain malformed network packets containing fragmented tunnel traffic, resulting in the security system hanging and losing visibility of network activity. An attacker can exploit this by sending specially crafted packets to disable network monitoring capabilities.
Technical details
This is a deadlock vulnerability (CWE-833) in Suricata's IP defragmentation code. The vulnerability occurs when processing fragmented network packets containing an encapsulated tunnel protocol whose payload is itself fragmented. The flaw is triggered by specially crafted network traffic (no authentication or privileges required), causing multiple threads to wait indefinitely for locks, resulting in service unavailability and loss of network visibility. Affected versions are 8.0.0 through 8.0.4; version 8.0.5 contains the fix. No known workarounds are available.
Affected products
- Open Information Security Foundation Suricata 8.0.0 to 8.0.4
Timeline
- 2026-06-02: disclosed
- 2026-05-19: patched: Suricata 8.0.5 released with fix
- 2026-09-16: advisory: CVE-2026-46352 published