{"id":"CVE-2026-71855","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-71855","generatedAt":"2026-10-28T04:12:25.538Z","title":"An IPv6 packet can therefore reuse IPv4 flow state or the reverse, causing incorrect flowbit state, detection bypass, or IP-only bypass.","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.","published":"2026-09-18T21:18:09.000Z","lastModified":"2026-09-28T18:39:09.000Z","status":"Analyzed","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},"cwe":["CWE-697"],"affected":["oisf/suricata"],"epss":{"score":0.00309,"percentile":0.2361,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.31%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"scored","label":"Newly scored","at":"2026-09-28T20:00:05.000Z","detail":{"from":"5.9","score":"7.5","severity":"HIGH","fromSeverity":"MEDIUM"},"summary":"Now scored CVSS 7.5 HIGH (was 5.9)."}],"references":[{"url":"https://github.com/OISF/suricata/commit/181b3b2fdd1fe87e4534de4fc79e29a083ef125f","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/OISF/suricata/commit/4e2f23d031fbcfd72883bacd3d723c9874f23701","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/OISF/suricata/commit/bc41dcc854e24487d3786ce578a8a86a8350ab20","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/OISF/suricata/releases/tag/suricata-7.0.17","tags":["Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/OISF/suricata/releases/tag/suricata-8.0.6","tags":["Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/OISF/suricata/security/advisories/GHSA-fvwh-wjcq-2586","tags":["Vendor Advisory"],"source":"security-advisories@github.com"},{"url":"https://redmine.openinfosecfoundation.org/issues/8558","tags":["Permissions Required"],"source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-71855","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}