CVE-2026-112112

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Source
https://cve.org/CVERecord?id=CVE-2026-112112
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-112112.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-112112
Downstream
Published
2026-10-18T23:01:05Z
Modified
2026-10-28T10:46:11Z
Severity
  • 2.3 (Low) CVSS_V4 - 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 CVSS Calculator
Summary
[none]
Details

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.

Database specific 
{
    "cna_assigner": "mitre",
    "cwe_ids": [
        "CWE-1284"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/112xxx/CVE-2026-112112.json"
}
References

Affected packages

Git / gitlab.nic.cz/labs/bird

Affected ranges

Type
GIT
Repo
https://gitlab.nic.cz/labs/bird
Events
Introduced
eb859a3fb063b261fb76304e5b8eca206e7a162a
Last Affected
0355729c3a546c910e20bcde423bf36da901f8b5
Introduced
e7bd976178a2b133c36492420c0ad0455253f81e
Fixed
7cf75587b6f38b87849fe192bf5dfd124b7702bc
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "2.0.9"
                },
                {
                    "last_affected": "2.20.0"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandardRange"
        },
        {
            "range": [
                {
                    "introduced": "3.0.0"
                },
                {
                    "last_affected": "3.4.0"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandardRange"
        },
        {
            "range": [
                {
                    "fixed": "7cf75587b6f38b87849fe192bf5dfd124b7702bc"
                }
            ],
            "source": "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

v2.*
v2.0.11
v2.0.12
v2.0.9
v2.13
v2.14
v2.15
v2.15.1
v2.16
v2.17
v2.17.1
v2.18
v2.19.0
v2.20.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-112112.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "function_hash": "229090560544273725761602135866517928676",
            "length": 458
        },
        "id": "CVE-2026-112112-3b67721b",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://gitlab.nic.cz/labs/bird@7cf75587b6f38b87849fe192bf5dfd124b7702bc",
        "target": {
            "file": "nest/rt-table.c",
            "function": "net_flow_has_dst_prefix"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "178650513370050159392139172367677478532",
                "116859890786643688913401054380615680596",
                "199835214834816365150078596172903014742",
                "74520440935283789291133757194401330261",
                "308945340999808692769847482912984720846",
                "108933539942124051696254556001265822419",
                "51444696898862736444247428569655808991",
                "328951968493196286871541378378702034472",
                "34276773467389988484911701840676676435",
                "166974203969495868129604343009155147342",
                "154207442395280129602185820498955138592",
                "61700505810734134559368425618798829690",
                "250052287726848803929295972176394786691",
                "303148009542548755650435127463835416786"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-112112-49c30d8c",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://gitlab.nic.cz/labs/bird@7cf75587b6f38b87849fe192bf5dfd124b7702bc",
        "target": {
            "file": "nest/rt-table.c"
        }
    }
]
vanir_signatures_modified 
"2026-10-28T10:46:11Z"