Medium severity5.9NVD Advisory· Published Sep 18, 2026· Updated Sep 28, 2026
CVE-2026-71855
CVE-2026-71855
Description
Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to 7.0.17 and 8.0.6, src/flow-hash.c can treat an IPv4 and IPv6 flow as equal without comparing the IP family when their raw address words, ports, protocol, VLAN, recursion level, live device, and hash bucket align. An IPv6 packet can therefore reuse IPv4 flow state or the reverse, causing incorrect flowbit state, detection bypass, or IP-only bypass. This issue is fixed in versions 8.0.6 and 7.0.17.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2Patches
Vulnerability mechanics
References
7- github.com/OISF/suricata/commit/181b3b2fdd1fe87e4534de4fc79e29a083ef125fnvdPatch
- github.com/OISF/suricata/commit/4e2f23d031fbcfd72883bacd3d723c9874f23701nvdPatch
- github.com/OISF/suricata/commit/bc41dcc854e24487d3786ce578a8a86a8350ab20nvdPatch
- github.com/OISF/suricata/security/advisories/GHSA-fvwh-wjcq-2586nvdVendor Advisory
- github.com/OISF/suricata/releases/tag/suricata-7.0.17nvdRelease Notes
- github.com/OISF/suricata/releases/tag/suricata-8.0.6nvdRelease Notes
- redmine.openinfosecfoundation.org/issues/8558nvdPermissions Required
News mentions
1- Suricata: 19 Vulnerabilities Disclosed Together, Critical Flaws in HTTP/2 and DoH2 ParsersVypr Intelligence · Sep 20, 2026