Bug 2538276 (CVE-2026-71855) - CVE-2026-71855 suricata: Suricata: Detection bypass via IPv4/IPv6 hash collision
Summary: CVE-2026-71855 suricata: Suricata: Detection bypass via IPv4/IPv6 hash collision
Keywords:
Status: NEW
Alias: CVE-2026-71855
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2539208
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-22 17:34 UTC by OSIDB Bzimport
Modified: 2026-09-23 08:37 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2026-09-22 17:34:27 UTC 
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.
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