Publish GHSA-2j22-pr5w-6gq8

Author: advisory-database[bot]

advisories/github-reviewed/2026/03/GHSA-2j22-pr5w-6gq8/GHSA-2j22-pr5w-6gq8.json

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+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-2j22-pr5w-6gq8",
+  "modified": "2026-03-26T22:19:02Z",
+  "published": "2026-03-26T22:19:02Z",
+  "aliases": [],
+  "summary": "Loofah has improper detection of disallowed URIs via `allowed_uri?`",
+  "details": "## Summary\n\n`Loofah::HTML5::Scrub.allowed_uri?` does not correctly reject `javascript:` URIs when the scheme is split by HTML entity-encoded control characters such as `
` (carriage return), `
` (line feed), or `	` (tab).\n\n## Details\n\nThe `allowed_uri?` method strips literal control characters before decoding HTML entities. Payloads like `java
script:alert(1)` survive the control character strip, then `
` is decoded to a carriage return, producing `java\\rscript:alert(1)`.\n\nNote that the Loofah sanitizer's default `sanitize()` path is **not affected** because Nokogiri decodes HTML entities during parsing before Loofah evaluates the URI protocol. This issue only affects direct callers of the `allowed_uri?` string-level helper when passing HTML-encoded strings.\n\n## Impact\n\nApplications that call `Loofah::HTML5::Scrub.allowed_uri?` to validate user-controlled URLs and then render approved URLs into `href` or other browser-interpreted URI attributes may be vulnerable to cross-site scripting (XSS).\n\nThis only affects Loofah `2.25.0`.\n\n## Mitigation\n\nUpgrade to Loofah >= `2.25.1`.\n\n## Credit\n\nResponsibly reported by HackOne user @smlee.",
+  "severity": [
+    {
+      "type": "CVSS_V4",
+      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "RubyGems",
+        "name": "loofah"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "2.25.0"
+            },
+            {
+              "fixed": "2.25.1"
+            }
+          ]
+        }
+      ],
+      "versions": [
+        "2.25.0"
+      ]
+    }
+  ],
+  "references": [
+    {
+      "type": "WEB",
+      "url": "https://github.com/flavorjones/loofah/security/advisories/GHSA-46fp-8f5p-pf2m"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/flavorjones/loofah/commit/f4ebc9c5193dde759a57541062e490e86fc7c068"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/flavorjones/loofah"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/flavorjones/loofah/releases/tag/v2.25.1"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/loofah/GHSA-46fp-8f5p-pf2m.yml"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-79",
+      "CWE-116"
+    ],
+    "severity": "LOW",
+    "github_reviewed": true,
+    "github_reviewed_at": "2026-03-26T22:19:02Z",
+    "nvd_published_at": null
+  }
+}