Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-09-10T21:25:22 Suricata: Suricata: Denial of Service via unbounded DNP3 reassembly 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CWE-1284

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, DNP3 reassembly could buffer data without sufficient parser-level bounds. Crafted DNP3 traffic may cause Suricata to consume excessive memory, potentially resulting in denial of service. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, disable DNP3 (which is not enabled by default) if it is not needed, and/or define a limited `stream.reassembly.depth` (0 or absent is unlimited).

A flaw was found in Suricata. DNP3 reassembly could buffer data without sufficient parser-level bounds. A remote attacker sending crafted DNP3 traffic may cause Suricata to consume excessive memory, potentially resulting in a denial of service.

Unbounded memory allocation during DNP3 stream reassembly in Suricata allows remote, unauthenticated attackers to send crafted DNP3 packet streams, causing excessive memory consumption and triggering a daemon crash. Default Red Hat deployments processing untrusted network streams with DNP3 inspection active expose the monitoring service to denial-of-service vectors without explicit parser depth boundaries. Disable DNP3 parsing in the Suricata configuration file or configure a restricted maximum stream reassembly depth using the `stream.reassembly.depth` setting to cap memory utilization. https://www.cve.org/CVERecord?id=CVE-2026-45765 https://nvd.nist.gov/vuln/detail/CVE-2026-45765 https://forum.suricata.io/t/suricata-8-0-5-and-7-0-16-released/6315 https://github.com/OISF/suricata/security/advisories/GHSA-m8x4-c78g-r4vj https://redmine.openinfosecfoundation.org/issues/8460