CVE-2026-71855

What it 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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data tampering.

Exploit odds

0.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-09-18 21:18 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-09-28 18:39 UTC Last updatedMost recent change to the record

Details

Published

2026-09-18 21:18 UTC

Last modified

2026-09-28 18:39 UTC

Exploit probability

0.3% · EPSS, next 30 days

Weakness

CWE-697

Record status

Analyzed

Affected

• Oisf Suricata < 7.0.17
• Oisf Suricata < 8.0.6

Attack profile CVSS 3.1 · 5.9

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None