{"id":"CVE-2026-112112","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-112112","generatedAt":"2026-10-28T03:58:52.530Z","title":"An IPv6 FlowSpec validation bypass in the CZ.NIC BIRD Internet Routing Daemon allows an established BGP peer to inject FlowSpec rules matching destinations outside the address space authorized by the unicast-route validation procedure.","description":"An IPv6 FlowSpec validation bypass in the CZ.NIC BIRD Internet Routing Daemon allows an established BGP peer to inject FlowSpec rules matching destinations outside the address space authorized by the unicast-route validation procedure. With validation enabled on the receiving flow6 channel, BIRD fails to reject a destination prefix component with a nonzero offset, contrary to RFC 8956 section 5. It validates a reconstructed prefix with zero-filled skipped bits, although the original FlowSpec component can match a broader set of IPv6 addresses. Given a suitable unicast route from the peer, the rule can pass validation and, where export policy permits, be propagated to downstream peers. Downstream enforcement may cause unauthorized traffic filtering or redirection.","published":"2026-10-18T23:16:57.000Z","lastModified":"2026-10-19T21:14:14.000Z","status":"Deferred","sourceIdentifier":"cve@mitre.org","cvss":{"version":"4.0","score":2.3,"severity":"LOW","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-1284"],"affected":[],"epss":{"score":0.00308,"percentile":0.2346,"date":"2026-10-27","history":[{"date":"2026-10-19","score":0.00307,"percentile":0.22127}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.31%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-18T23:16:57.000Z","detail":{"score":"2.3","severity":"LOW","publishedAt":"2026-10-18T23:16:56.767Z"},"summary":"New CVE, low severity (CVSS 2.3)."}],"references":[{"url":"https://gitlab.nic.cz/labs/bird/-/blob/v2.20.0/nest/rt-table.c#L2686","source":"cve@mitre.org"},{"url":"https://gitlab.nic.cz/labs/bird/-/blob/v3.4.0/nest/rt-table.c#L4518","source":"cve@mitre.org"},{"url":"https://gitlab.nic.cz/labs/bird/-/commit/7cf75587b6f38b87849fe192bf5dfd124b7702bc","source":"cve@mitre.org"},{"url":"https://www.rfc-editor.org/rfc/rfc8956.html#section-5","source":"cve@mitre.org"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-112112","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."}