{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-114437",
        "assignerOrgId": "5ac1ecc2-367a-4d16-a0b2-35d495ddd0be",
        "state": "PUBLISHED",
        "assignerShortName": "tenable",
        "dateReserved": "2026-10-21T13:42:40.246Z",
        "datePublished": "2026-10-21T13:52:25.617Z",
        "dateUpdated": "2026-10-21T17:19:13.809Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "5ac1ecc2-367a-4d16-a0b2-35d495ddd0be",
                "shortName": "tenable",
                "dateUpdated": "2026-10-21T13:52:25.617Z"
            },
            "title": "Chi Client IP Spoofing in ClientIPFromXFF via X-Forwarded-For",
            "datePublic": "2026-10-21T15:00:00.000Z",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-348",
                            "description": "CWE-348 Use of Less Trusted Source",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "go-chi",
                    "product": "chi",
                    "collectionURL": "https://pkg.go.dev",
                    "packageName": "github.com/go-chi/chi/v5",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "lessThan": "5.4.0",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Golang Chi web framework, the ClientIPFromXFF middleware skips any X-Forwarded-For entry in a configured trusted CIDR but never verifies that the direct TCP peer in http.Request.RemoteAddr belongs to that CIDR. A client that can reach the Go server directly can therefore append a trusted-looking proxy address and choose the client IP returned by middleware.GetClientIP.\n\nThis issue affects chi before 5.4.0.",
                    "supportingMedia": [
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                            "type": "text/html",
                            "base64": false,
                            "value": "In the Golang Chi web framework, the <code>ClientIPFromXFF</code> middleware skips any <code>X-Forwarded-For</code> entry in a configured trusted CIDR but never verifies that the direct TCP peer in <code>http.Request.RemoteAddr</code> belongs to that CIDR. A client that can reach the Go server directly can therefore append a trusted-looking proxy address and choose the client IP returned by <code>middleware.GetClientIP</code>.<p>This issue affects chi before 5.4.0.</p>"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://www.tenable.com/security/research/tra-2026-66"
                },
                {
                    "url": "https://github.com/go-chi/chi/security/advisories/GHSA-j6qf-3m9c-vwj3"
                }
            ],
            "metrics": [
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                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
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                    ],
                    "cvssV3_1": {
                        "version": "3.1",
                        "attackVector": "NETWORK",
                        "attackComplexity": "HIGH",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "LOW",
                        "integrityImpact": "LOW",
                        "availabilityImpact": "NONE",
                        "baseSeverity": "MEDIUM",
                        "baseScore": 4.8,
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"
                    }
                },
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                        "attackVector": "NETWORK",
                        "attackComplexity": "HIGH",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "LOW",
                        "subConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "LOW",
                        "subIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "exploitMaturity": "NOT_DEFINED",
                        "Safety": "NOT_DEFINED",
                        "Automatable": "NOT_DEFINED",
                        "Recovery": "NOT_DEFINED",
                        "valueDensity": "NOT_DEFINED",
                        "vulnerabilityResponseEffort": "NOT_DEFINED",
                        "providerUrgency": "NOT_DEFINED",
                        "version": "4.0",
                        "baseSeverity": "MEDIUM",
                        "baseScore": 6.3,
                        "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"
                    }
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "Joshua Martinelle",
                    "type": "finder"
                }
            ],
            "source": {
                "discovery": "EXTERNAL"
            },
            "x_generator": {
                "engine": "Vulnogram 1.0.5"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "id": "CVE-2026-114437",
                                "role": "CISA Coordinator",
                                "options": [
                                    {
                                        "Exploitation": "poc"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "version": "2.0.3",
                                "timestamp": "2026-10-21T15:16:38.882767Z"
                            }
                        }
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                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-10-21T17:19:13.809Z"
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}