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        "cveId": "CVE-2026-112112",
        "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "state": "PUBLISHED",
        "assignerShortName": "mitre",
        "dateReserved": "2026-10-18T23:01:05.103Z",
        "datePublished": "2026-10-18T23:01:05.633Z",
        "dateUpdated": "2026-10-19T18:41:47.949Z"
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        "cna": {
            "affected": [
                {
                    "defaultStatus": "unknown",
                    "modules": [
                        "IPv6 FlowSpec validation"
                    ],
                    "product": "BIRD",
                    "programFiles": [
                        "nest/rt-table.c"
                    ],
                    "programRoutines": [
                        {
                            "name": "net_flow_has_dst_prefix"
                        }
                    ],
                    "repo": "https://gitlab.nic.cz/labs/bird",
                    "vendor": "nic",
                    "versions": [
                        {
                            "lessThanOrEqual": "2.20.0",
                            "status": "affected",
                            "version": "2.0.9",
                            "versionType": "semver"
                        },
                        {
                            "lessThanOrEqual": "3.4.0",
                            "status": "affected",
                            "version": "3.0.0",
                            "versionType": "semver"
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                            "value": "<p>An established BGP peer must be able to send IPv6 FlowSpec to a receiving flow6 channel configured with \"validate yes\". A suitable unicast route from that peer must be present in the base table. Propagation additionally requires an export policy permitting the rule. Data-plane impact depends on downstream support for, acceptance of, and enforcement of the FlowSpec match and action.</p>"
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                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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."
                }
            ],
            "metrics": [
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                        "Recovery": "NOT_DEFINED",
                        "Safety": "NOT_DEFINED",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "attackVector": "NETWORK",
                        "baseScore": 2.3,
                        "baseSeverity": "LOW",
                        "privilegesRequired": "LOW",
                        "providerUrgency": "NOT_DEFINED",
                        "subAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "userInteraction": "NONE",
                        "valueDensity": "NOT_DEFINED",
                        "vectorString": "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",
                        "version": "4.0",
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                        "vulnIntegrityImpact": "LOW",
                        "vulnerabilityResponseEffort": "NOT_DEFINED"
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            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-1284",
                            "description": "CWE-1284 Improper Validation of Specified Quantity in Input",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
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                "shortName": "mitre",
                "dateUpdated": "2026-10-18T23:01:05.633Z"
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            "references": [
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://gitlab.nic.cz/labs/bird/-/commit/7cf75587b6f38b87849fe192bf5dfd124b7702bc"
                },
                {
                    "url": "https://www.rfc-editor.org/rfc/rfc8956.html#section-5"
                },
                {
                    "url": "https://gitlab.nic.cz/labs/bird/-/blob/v2.20.0/nest/rt-table.c#L2686"
                },
                {
                    "url": "https://gitlab.nic.cz/labs/bird/-/blob/v3.4.0/nest/rt-table.c#L4518"
                }
            ],
            "solutions": [
                {
                    "lang": "en",
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                            "type": "text/html",
                            "value": "<p>Apply upstream commit 7cf75587b6f38b87849fe192bf5dfd124b7702bc or a verified branch-specific backport. The fix requires the original IPv6 destination-prefix component to have offset zero before it can pass FlowSpec validation. The first fixed release has not yet been verified.</p>"
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                                    "versionEndIncluding": "2.20.0"
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                                    "criteria": "cpe:2.3:a:nic:bird:*:*:*:*:*:*:*:*",
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        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-10-19T18:39:04.870755Z",
                                "id": "CVE-2026-112112",
                                "options": [
                                    {
                                        "Exploitation": "none"
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                                "role": "CISA Coordinator",
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                "title": "CISA ADP Vulnrichment",
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