CVE-2026-71855: CWE-697: Incorrect Comparison in OISF suricata
CVE-2026-71855 is a medium severity vulnerability in the Suricata network security engine. It involves an incorrect comparison in flow hashing that can cause IPv4 and IPv6 flows to be treated as equal under certain conditions, leading to incorrect flowbit state and potential detection bypass. This flaw affects Suricata versions prior to 7.0.17 and 8.0.6 and has been fixed in those versions.
AI Analysis
Technical Summary
Suricata versions before 7.0.17 and 8.0.6 contain a flaw in src/flow-hash.c where IPv4 and IPv6 flows can be incorrectly considered equal if their raw address words, ports, protocol, VLAN, recursion level, live device, and hash bucket match, without comparing the IP family. This can cause an IPv6 packet to reuse IPv4 flow state or vice versa, resulting in incorrect flowbit state, detection bypass, or IP-only bypass. The issue is resolved in Suricata 7.0.17 and 8.0.6.
Potential Impact
The vulnerability can lead to detection bypass in Suricata by causing incorrect flowbit state when IPv4 and IPv6 flows are treated as equal improperly. This undermines the accuracy of network intrusion detection and prevention, potentially allowing malicious traffic to evade detection. There is no impact on confidentiality or availability reported.
Mitigation Recommendations
Upgrade Suricata to version 7.0.17 or later, or 8.0.6 or later, where this issue is fixed. No other mitigation is required as the vendor has provided an official fix.
CVE-2026-71855: CWE-697: Incorrect Comparison in OISF suricata
Description
CVE-2026-71855 is a medium severity vulnerability in the Suricata network security engine. It involves an incorrect comparison in flow hashing that can cause IPv4 and IPv6 flows to be treated as equal under certain conditions, leading to incorrect flowbit state and potential detection bypass. This flaw affects Suricata versions prior to 7.0.17 and 8.0.6 and has been fixed in those versions.
CVSS v3.1
Score 5.9medium
Affected software
OISF
suricata
pkg:github/oisf/suricataRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Suricata versions before 7.0.17 and 8.0.6 contain a flaw in src/flow-hash.c where IPv4 and IPv6 flows can be incorrectly considered equal if their raw address words, ports, protocol, VLAN, recursion level, live device, and hash bucket match, without comparing the IP family. This can cause an IPv6 packet to reuse IPv4 flow state or vice versa, resulting in incorrect flowbit state, detection bypass, or IP-only bypass. The issue is resolved in Suricata 7.0.17 and 8.0.6.
Potential Impact
The vulnerability can lead to detection bypass in Suricata by causing incorrect flowbit state when IPv4 and IPv6 flows are treated as equal improperly. This undermines the accuracy of network intrusion detection and prevention, potentially allowing malicious traffic to evade detection. There is no impact on confidentiality or availability reported.
Mitigation Recommendations
Upgrade Suricata to version 7.0.17 or later, or 8.0.6 or later, where this issue is fixed. No other mitigation is required as the vendor has provided an official fix.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-07T18:26:53.523Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aada35c55bf5e2cf587fb14
Added to database: 09/18/2026, 20:47:24 UTC
Last enriched: 09/18/2026, 21:01:52 UTC
Last updated: 09/18/2026, 21:33:03 UTC
Views: 5
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