CVE-2026-71855
Medium
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.
SeverityMedium
CVSS5.9
Exploit probability—
ProductOisf Suricata
PublishedSep 18, 2026
First seenSep 18, 2026
Weakness typeCWE-697CWE-697
How to fix
Update
- oisf suricata7.0.17, 8.0.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| oisf suricata | v < 7.0.17, 8.0.0 ≤ v < 8.0.6 | 7.0.17, 8.0.6 |
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