CRLF Injection in Nodejs ‘undici’ via host

@@ -304,6 +304,9 @@ function processHeader (request, key, val) {
     key.length === 4 &&
     key.toLowerCase() === 'host'
   ) {
+    if (headerCharRegex.exec(val) !== null) {
+      throw new InvalidArgumentError(`invalid ${key} header`)
+    }
     // Consumed by Client
     request.host = val
   } else if (

@@ -0,0 +1,37 @@
+'use strict'
+
+const { test } = require('tap')
+const { Client } = require('..')
+const { createServer } = require('http')
+const EE = require('events')
+
+test('CRLF Injection in Nodejs ‘undici’ via host', (t) => {
+  t.plan(1)
+
+  const server = createServer(async (req, res) => {
+    res.end()
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const client = new Client(`http://localhost:${server.address().port}`)
+    t.teardown(client.close.bind(client))
+
+    const unsanitizedContentTypeInput =  '12 \r\n\r\naaa:aaa'
+
+    try {
+      const { body } = await client.request({
+        path: '/',
+        method: 'POST',
+        headers: {
+          'content-type': 'application/json',
+          'host': unsanitizedContentTypeInput
+        },
+        body: 'asd'
+      })
+      await body.dump()
+    } catch (err) {
+      t.same(err.code, 'UND_ERR_INVALID_ARG')
+    }
+  })
+})