Executive brief
Suricata is a network security monitoring engine used to detect and prevent intrusions. A vulnerability in HTTP header parsing allows attackers to send crafted network traffic that causes excessive CPU consumption, potentially disabling the monitoring system and leaving networks unprotected.
Technical details
A quadratic parsing vulnerability exists in Suricata's HTTP/1 Content-Disposition header processing. The HTTP response body parser repeatedly performs expensive parsing operations on large Content-Disposition headers without proper optimization. An unauthenticated attacker on the network can craft HTTP traffic with oversized Content-Disposition headers to trigger excessive CPU usage and denial of service. The vulnerability requires no authentication or user interaction and is remotely exploitable via network traffic. Patches are available in Suricata versions 7.0.16 and 8.0.5; a workaround using detection rules is provided for unpatched systems.
Affected products
- OISF Suricata before 7.0.16 and before 8.0.5
Timeline
- 2026-06-02: disclosed
- 2026-05-19: patched: Suricata 7.0.16 and 8.0.5 released