---
id: CVE-2026-71855
title: >-
  Suricata is a network Intrusion Detection System, Intrusion Prevention System
  and Network Security Monitoring engine
summary: >-
  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 whe…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-697
vendor: OISF
product: suricata
affected:
  - 'suricata >= 8.0.0, < 8.0.6'
  - suricata < 7.0.17
published: '2026-09-18'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T18:12:04.247'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-71855'
references:
  - url: >-
      https://github.com/OISF/suricata/commit/181b3b2fdd1fe87e4534de4fc79e29a083ef125f
    label: security-advisories@github.com
  - url: >-
      https://github.com/OISF/suricata/commit/4e2f23d031fbcfd72883bacd3d723c9874f23701
    label: security-advisories@github.com
  - url: >-
      https://github.com/OISF/suricata/commit/bc41dcc854e24487d3786ce578a8a86a8350ab20
    label: security-advisories@github.com
  - url: 'https://github.com/OISF/suricata/releases/tag/suricata-7.0.17'
    label: security-advisories@github.com
  - url: 'https://github.com/OISF/suricata/releases/tag/suricata-8.0.6'
    label: security-advisories@github.com
  - url: 'https://github.com/OISF/suricata/security/advisories/GHSA-fvwh-wjcq-2586'
    label: security-advisories@github.com
  - url: 'https://redmine.openinfosecfoundation.org/issues/8558'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
epss: 0.00312
epssPercentile: 0.243
ingestedAt: '2026-09-18T20:51:25.793Z'
---

## Overview

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

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.