CVE-2026-71855Network attack vectorHinoki check available

Detection bypass via cross-family flow state reuse

Published Sep 18, 2026 · Updated Sep 18, 2026

Incorrect flow comparison in OISF Suricata before 7.0.17 and 8.0.0 through 8.0.5 allows remote attackers to bypass detection. Flow comparisons in src/flow-hash.c match raw address words and other tuple fields without checking the IP family, so colliding IPv4 and IPv6 packets can share flow state. Exploitation requires aligned addresses, ports, protocol, VLAN, recursion level, live device, and hash bucket; the result is incorrect flowbits or IP-only bypass, not code execution.

CVSS severity5.9
Medium
EPSS probability0.31%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Incorrect flow comparison in OISF Suricata before 7.0.17 and 8.0.0 through 8.0.5 allows remote attackers to bypass detection. Flow comparisons in src/flow-hash.c match raw address words and other tuple fields without checking the IP family, so colliding IPv4 and IPv6 packets can share flow state. Exploitation requires aligned addresses, ports, protocol, VLAN, recursion level, live device, and hash bucket; the result is incorrect flowbits or IP-only bypass, not code execution.

The record

CVE
CVE-2026-71855
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
Open Information Security Foundation
Product
Suricata
Classifications
CWE-697, T1562.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 7.0.17
  2. Affected versionversion=>= 8.0.0, < 8.0.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Open Information Security Foundation · Suricataversion=< 7.0.17; version=>= 8.0.0, < 8.0.6

Published CVSS scores

5.9GitHub CNACVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-697Incorrect Comparison
T1562.001Impair Defenses: Disable or Modify Tools

Public exploit references

No public exploit references are available in this record.

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Technologies

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Your stack

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