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CVE-2026-71855

5.9 · MEDIUM

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine.

Published Sep 18, 2026oisfCWE-697EPSS 0.31%

Overview

CVE-2026-71855 is a medium-severity vulnerability affecting oisf suricata. It was published on September 18, 2026 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from oisf. Update suricata to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
oisfsuricata>= 0, < 7.0.17Affected

References

GitHubgithub.com/OISF/suricata/commit/181b3b2fdd1fe87e4534de4fc79e29a083ef125fGitHubgithub.com/OISF/suricata/commit/4e2f23d031fbcfd72883bacd3d723c9874f23701GitHubgithub.com/OISF/suricata/commit/bc41dcc854e24487d3786ce578a8a86a8350ab20GitHubgithub.com/OISF/suricata/releases/tag/suricata-7.0.17GitHubgithub.com/OISF/suricata/releases/tag/suricata-8.0.6GitHubgithub.com/OISF/suricata/security/advisories/GHSA-fvwh-wjcq-2586Refredmine.openinfosecfoundation.org/issues/8558

How CyberStrike helps

Frequently asked questions

What is CVE-2026-71855?

CVE-2026-71855 is a medium-severity vulnerability affecting oisf suricata. It was published on September 18, 2026 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2026-71855?

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-71855?

Check the references section for vendor advisories and patches from oisf. Update suricata to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-71855?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-71855 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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