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+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-f27p-cmv8-xhm6",
+  "modified": "2025-01-06T22:27:09Z",
+  "published": "2025-01-06T22:27:09Z",
+  "aliases": [
+    "CVE-2025-21620"
+  ],
+  "summary": "fetch: Authorization headers not dropped when redirecting cross-origin",
+  "details": "### Summary\nWhen you send a request with the `Authorization` header to one domain, and the response asks to redirect to a different domain, Deno's`fetch()` redirect handling creates a follow-up redirect request that keeps the original `Authorization` header, leaking its content to that second domain.\n\n\n### Details\n\nThe [right behavior](https://fetch.spec.whatwg.org/#ref-for-cors-non-wildcard-request-header-name) would be to drop the `Authorization` header instead, in this scenario. The same is generally applied to `Cookie` and `Proxy-Authorization` headers, and is done for not only host changes, but also protocol/port changes. Generally referred to as \"origin\".\n\nThe [documentation](https://docs.deno.com/runtime/reference/web_platform_apis/#:~:text=Deno%20does%20not%20follow%20the,leaking%20authenticated%20data%20cross%20origin.) states: \n> Deno does not follow the same-origin policy, because the Deno user agent currently does not have the concept of origins, and it does not have a cookie jar. This means Deno **does not need** to protect against leaking authenticated data cross origin \n\n### Reproduction\n```ts\nconst ac = new AbortController()\n\nconst server1 = Deno.serve({ port: 3001, signal: ac.signal }, (req) => {\n  return new Response(null, {\n    status: 302,\n    headers: {\n      'location': 'http://localhost:3002/redirected'\n    },\n  })\n})\n\nconst server2 = Deno.serve({ port: 3002, signal: ac.signal }, (req) => {\n  const body = JSON.stringify({\n    url: req.url,\n    hasAuth: req.headers.has('authorization'),\n  })\n  return new Response(body, {\n    status: 200,\n    headers: {'content-type': 'application/json'},\n  })\n})\n\nasync function main() {\n  const response = await fetch(\"http://localhost:3001/\", {\n    headers: {authorization: 'Bearer foo'}\n  })\n  const body = await response.json()\n  \n  ac.abort()\n  \n  if (body.hasAuth) {\n    console.error('ERROR: Authorization header should not be present after cross-origin redirect')\n  } else {\n    console.log('SUCCESS: Authorization header is not present after cross-origin redirect')\n  }\n}\n\nsetTimeout(main, 500)\n```\n",
+  "severity": [
+    {
+      "type": "CVSS_V3",
+      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "crates.io",
+        "name": "deno_fetch"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0.0.1"
+            },
+            {
+              "fixed": "0.204.0"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "package": {
+        "ecosystem": "crates.io",
+        "name": "deno"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0"
+            },
+            {
+              "last_affected": "1.46.3"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "package": {
+        "ecosystem": "crates.io",
+        "name": "deno"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "2.0.0"
+            },
+            {
+              "fixed": "2.1.2"
+            }
+          ]
+        }
+      ]
+    }
+  ],
+  "references": [
+    {
+      "type": "WEB",
+      "url": "https://github.com/denoland/deno/security/advisories/GHSA-f27p-cmv8-xhm6"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/denoland/deno"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-200"
+    ],
+    "severity": "HIGH",
+    "github_reviewed": true,
+    "github_reviewed_at": "2025-01-06T22:27:09Z",
+    "nvd_published_at": null
+  }
+}
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