CVE-2026-71855

MEDIUM 5.9

Suricata flow: IPv4/IPv6 hash collision can reuse wrong flow state

CVSS Score

5.9

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-697
Vendor	oisf
Product	suricata
Published	Sep 18, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Affected Versions

OISF / suricata

>= 8.0.0, < 8.0.6 < 7.0.17

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/OISF/suricata/security/advisories/GHSA-fvwh-wjcq-2586 github.com: https://github.com/OISF/suricata/commit/181b3b2fdd1fe87e4534de4fc79e29a083ef125f github.com: https://github.com/OISF/suricata/commit/4e2f23d031fbcfd72883bacd3d723c9874f23701 github.com: https://github.com/OISF/suricata/commit/bc41dcc854e24487d3786ce578a8a86a8350ab20 github.com: https://github.com/OISF/suricata/releases/tag/suricata-7.0.17 github.com: https://github.com/OISF/suricata/releases/tag/suricata-8.0.6 redmine.openinfosecfoundation.org: https://redmine.openinfosecfoundation.org/issues/8558