{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-126209",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-11-10T20:07:44.958Z",
        "datePublished": "2026-11-12T21:01:58.128Z",
        "dateUpdated": "2026-11-12T21:01:58.128Z"
    },
    "containers": {
        "cna": {
            "title": "Loofah allowed_uri? treats javascript&#x3a alert(1) as safe",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-79",
                            "lang": "en",
                            "description": "CWE-79: Improper Neutralization of Input During Web Page Generation",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-184",
                            "lang": "en",
                            "description": "CWE-184: Incomplete List of Disallowed Inputs",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "PASSIVE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "LOW",
                        "subIntegrityImpact": "LOW",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 5.3,
                        "baseSeverity": "MEDIUM",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/flavorjones/loofah/security/advisories/GHSA-p9wj-w8xq-vjx6",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/flavorjones/loofah/security/advisories/GHSA-p9wj-w8xq-vjx6"
                },
                {
                    "name": "https://github.com/flavorjones/loofah/pull/324",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/flavorjones/loofah/pull/324"
                },
                {
                    "name": "https://github.com/flavorjones/loofah/commit/62c04841e8252a1b5373afcd2b89fb9b8279e317",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/flavorjones/loofah/commit/62c04841e8252a1b5373afcd2b89fb9b8279e317"
                },
                {
                    "name": "https://github.com/flavorjones/loofah/releases/tag/v2.25.3",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/flavorjones/loofah/releases/tag/v2.25.3"
                }
            ],
            "affected": [
                {
                    "vendor": "flavorjones",
                    "product": "loofah",
                    "versions": [
                        {
                            "version": ">= 2.25.0, < 2.25.3",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-11-12T21:01:58.128Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. From 2.25.0 until 2.25.3, Loofah::HTML5::Scrub.allowed_uri? strips whitespace and control characters before decoding a semicolon-less numeric character reference, changing where the reference ends and hiding a javascript: or vbscript: scheme that a browser reconstructs. The bypass applies to encoded colons and encoded scheme letters when a stripped character terminates the numeric reference. An application that renders the approved value in href or another browser-interpreted URI attribute can allow cross-site scripting, and Rails::HTML::Sanitizer.allowed_uri? re-exports the affected helper. Loofah's default sanitize() path is not affected because Nokogiri decodes entities before URI evaluation. This issue is fixed in version 2.25.3."
                }
            ],
            "source": {
                "advisory": "GHSA-p9wj-w8xq-vjx6",
                "discovery": "UNKNOWN"
            }
        }
    }
}