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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-71855
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-18 21:18:08 UTC
Updated2026-09-18 21:18:08 UTC
DescriptionSuricata 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.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

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

EPSS: 0.003120000 probability, percentile 0.242880000 (date 2026-09-19)

Problem Types: CWE-697 | CWE-697 CWE-697: Incorrect Comparison

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
3.1CNADECLARED5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OISF Suricata affected >= 8.0.0, < 8.0.6 Not specified
CNA OISF Suricata affected < 7.0.17 Not specified

References

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