OISF Suricata up to 7.0.16/8.0.5 Flow Hash src/flow-hash.c input validation

Summaryinfo

A vulnerability was found in OISF Suricata up to 7.0.16/8.0.5. It has been rated as critical. This affects an unknown part of the file src/flow-hash.c of the component Flow Hash. This manipulation causes input validation. This vulnerability is tracked as CVE-2026-71855. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in OISF Suricata up to 7.0.16/8.0.5. Affected by this vulnerability is an unknown function of the file src/flow-hash.c of the component Flow Hash. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-71855 since 08/07/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 7.0.17 or 8.0.6 eliminates this vulnerability.

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Productinfo

Vendor

• OISF

Name

• Suricata

Version

• 7.0.0
• 7.0.1
• 7.0.2
• 7.0.3
• 7.0.4
• 7.0.5
• 7.0.6
• 7.0.7
• 7.0.8
• 7.0.9
• 7.0.10
• 7.0.11
• 7.0.12
• 7.0.13
• 7.0.14
• 7.0.15
• 7.0.16
• 8.0.0
• 8.0.1
• 8.0.2
• 8.0.3
• 8.0.4
• 8.0.5

License

• open-source

Website

• Product: https://github.com/OISF/suricata/

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