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CVE-2026-71855

7.5, high

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

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
7.5, high high CVSS v3.1
EPSS, next 30 days
0.3% higher than 22.2% of scored CVEs
Exploitation
No public evidence
Published
18 Sept 202629 days ago

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.

Details

Vendor
OISF
Product
suricata
Weakness
CWE-697 (opens in a new tab)
Status
Analyzed
Updated
28 Sept 2026
Assigner
security-advisories@github.com

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

References 7

Patches and fixes 3

Advisories 1

Other references 3

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other OISF CVEs

Every OISF CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-57228 OISF suricata Out-of-Bounds Read Vulnerability EPSS 0.4% 9.1, critical
  • CVE-2026-63448 OISF suricata Uncontrolled Resource Consumption Vulnerability EPSS 0.4% 7.5, high
  • CVE-2026-45751 OISF suricata Use-After-Free Vulnerability EPSS 0.3% 7.5, high

Beyond this page

Is CVE-2026-71855 in your network?

This page tells you how dangerous CVE-2026-71855 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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    Detect it if it's exploited

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.