{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-71855", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-08-07T18:26:53.523Z", "datePublished": "2026-09-18T20:25:58.646Z", "dateUpdated": "2026-09-25T19:22:13.492Z"}, "containers": {"cna": {"title": "Suricata flow: IPv4/IPv6 hash collision can reuse wrong flow state", "problemTypes": [{"descriptions": [{"cweId": "CWE-697", "lang": "en", "description": "CWE-697: Incorrect Comparison", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/OISF/suricata/security/advisories/GHSA-fvwh-wjcq-2586", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/OISF/suricata/security/advisories/GHSA-fvwh-wjcq-2586"}, {"name": "https://github.com/OISF/suricata/commit/181b3b2fdd1fe87e4534de4fc79e29a083ef125f", "tags": ["x_refsource_MISC"], "url": "https://github.com/OISF/suricata/commit/181b3b2fdd1fe87e4534de4fc79e29a083ef125f"}, {"name": "https://github.com/OISF/suricata/commit/4e2f23d031fbcfd72883bacd3d723c9874f23701", "tags": ["x_refsource_MISC"], "url": "https://github.com/OISF/suricata/commit/4e2f23d031fbcfd72883bacd3d723c9874f23701"}, {"name": "https://github.com/OISF/suricata/commit/bc41dcc854e24487d3786ce578a8a86a8350ab20", "tags": ["x_refsource_MISC"], "url": "https://github.com/OISF/suricata/commit/bc41dcc854e24487d3786ce578a8a86a8350ab20"}, {"name": "https://github.com/OISF/suricata/releases/tag/suricata-7.0.17", "tags": ["x_refsource_MISC"], "url": "https://github.com/OISF/suricata/releases/tag/suricata-7.0.17"}, {"name": "https://github.com/OISF/suricata/releases/tag/suricata-8.0.6", "tags": ["x_refsource_MISC"], "url": "https://github.com/OISF/suricata/releases/tag/suricata-8.0.6"}, {"name": "https://redmine.openinfosecfoundation.org/issues/8558", "tags": ["x_refsource_MISC"], "url": "https://redmine.openinfosecfoundation.org/issues/8558"}], "affected": [{"vendor": "OISF", "product": "suricata", "versions": [{"version": ">= 8.0.0, < 8.0.6", "status": "affected"}, {"version": "< 7.0.17", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-18T20:25:58.646Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-fvwh-wjcq-2586", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-25T19:22:03.750556Z", "id": "CVE-2026-71855", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-25T19:22:13.492Z"}}]}}

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{"affected": [{"affectedData": [{"product": "suricata", "vendor": "OISF", "versions": [{"status": "affected", "version": ">= 8.0.0, < 8.0.6"}, {"status": "affected", "version": "< 7.0.17"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:oisf:suricata:*:*:*:*:*:*:*:*", "matchCriteriaId": "EBABA2A6-27D4-455F-B761-CE55E448863F", "versionEndExcluding": "7.0.17", "vulnerable": true}, {"criteria": "cpe:2.3:a:oisf:suricata:*:*:*:*:*:*:*:*", "matchCriteriaId": "BAC11753-611D-4E10-9F9B-1C21DD2371C4", "versionEndExcluding": "8.0.6", "versionStartIncluding": "8.0.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-71855", "lastModified": "2026-09-28T18:39:08.780", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-71855", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-25T19:22:03.750556Z", "version": "2.0.3"}}]}, "published": "2026-09-18T21:18:08.750", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/OISF/suricata/commit/181b3b2fdd1fe87e4534de4fc79e29a083ef125f"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/OISF/suricata/commit/4e2f23d031fbcfd72883bacd3d723c9874f23701"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/OISF/suricata/commit/bc41dcc854e24487d3786ce578a8a86a8350ab20"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/OISF/suricata/releases/tag/suricata-7.0.17"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/OISF/suricata/releases/tag/suricata-8.0.6"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/OISF/suricata/security/advisories/GHSA-fvwh-wjcq-2586"}, {"source": "security-advisories@github.com", "tags": ["Permissions Required"], "url": "https://redmine.openinfosecfoundation.org/issues/8558"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-697"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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