diff --git a/CHANGELOG.md b/CHANGELOG.md
index 96132cd..3096b53 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,13 @@
 # CHANGELOG
 
 
+## 1.9.2 (Unreleased)
+
+* Reject handshake request lines with a bare line feed ending or a non-literal HTTP version
+* Match `server_ssl_` socket option keys to the true end of input
+* Pass explicit trim characters ahead of the PHP 8.6 trim default change
+
+
 ## 1.9.1 (2026-07-06)
 
 * Fix `waitForData` crash when the socket is disconnected
diff --git a/src/Protocol/Protocol.php b/src/Protocol/Protocol.php
index 1d4cef2..8070bce 100644
--- a/src/Protocol/Protocol.php
+++ b/src/Protocol/Protocol.php
@@ -120,7 +120,7 @@ abstract class Protocol
     /**
      * Used for parsing requested path. preg_* compatible.
      */
-    public const REQUEST_LINE_REGEX = '/^GET (\S+) HTTP\/1.1$/';
+    public const REQUEST_LINE_REGEX = '/^GET (\S+) HTTP\/1\.1$/D';
 
     /**
      * printf compatible.
@@ -459,9 +459,9 @@ public function validateResponseHandshake(string $response, string $key): bool
         $statusCode = $this->getStatusCode($response);
 
         if (self::HTTP_SWITCHING_PROTOCOLS !== $statusCode) {
-            $errorMessage = \explode("\n", \trim($this->getBody($response)), 2)[0];
+            $errorMessage = \explode("\n", \trim($this->getBody($response), " \n\r\t\0\x0B"), 2)[0];
 
-            throw new HandshakeException(\trim(\sprintf('Expected handshake response status code %d, but received %d. %s', self::HTTP_SWITCHING_PROTOCOLS, $statusCode, $errorMessage)));
+            throw new HandshakeException(\trim(\sprintf('Expected handshake response status code %d, but received %d. %s', self::HTTP_SWITCHING_PROTOCOLS, $statusCode, $errorMessage), " \n\r\t\0\x0B"));
         }
 
         $acceptHeaderValue = $this->getHeaders($response)[self::HEADER_ACCEPT] ?? '';
@@ -510,12 +510,12 @@ protected function getHeaders(string $response): array
             if (2 == \count($parts)) {
                 [$name, $value] = $parts;
                 if (!isset($return[$name])) {
-                    $return[$name] = \trim($value);
+                    $return[$name] = \trim($value, " \n\r\t\0\x0B");
                 } else {
                     if (\is_array($return[$name])) {
-                        $return[$name][] = \trim($value);
+                        $return[$name][] = \trim($value, " \n\r\t\0\x0B");
                     } else {
-                        $return[$name] = [$return[$name], \trim($value)];
+                        $return[$name] = [$return[$name], \trim($value, " \n\r\t\0\x0B")];
                     }
                 }
             }
@@ -608,7 +608,7 @@ public function validateRequestHandshake(string $request): array
             throw new BadRequestException('No key header received');
         }
 
-        $key = \trim($headers[self::HEADER_KEY]);
+        $key = \trim($headers[self::HEADER_KEY], " \n\r\t\0\x0B");
 
         if (!$key) {
             throw new BadRequestException('Invalid key');
diff --git a/src/Socket/ServerSocket.php b/src/Socket/ServerSocket.php
index 5ba559c..dcb31f5 100644
--- a/src/Socket/ServerSocket.php
+++ b/src/Socket/ServerSocket.php
@@ -113,7 +113,7 @@ protected function getSslStreamContextOptions(): array
 
         // Otherwise map any options through
         foreach ($this->options as $option => $value) {
-            if (\preg_match('/^server_ssl_(.*)$/', $option, $matches)) {
+            if (\preg_match('/^server_ssl_(.*)$/D', $option, $matches)) {
                 $options[$matches[1]] = $value;
             }
         }
diff --git a/tests/Protocol/ProtocolBaseTest.php b/tests/Protocol/ProtocolBaseTest.php
index a2c31f0..9b293b7 100644
--- a/tests/Protocol/ProtocolBaseTest.php
+++ b/tests/Protocol/ProtocolBaseTest.php
@@ -4,6 +4,7 @@
 
 use Exception;
 use InvalidArgumentException;
+use Wrench\Exception\BadRequestException;
 use Wrench\Test\BaseTest;
 
 abstract class ProtocolBaseTest extends BaseTest
@@ -35,6 +36,16 @@ public function testValidatHandshakeRequestValid(string $request): void
         }
     }
 
+    /**
+     * @dataProvider getInvalidHandshakeRequestLines
+     */
+    public function testValidateHandshakeRequestLineInvalid(string $request): void
+    {
+        $this->expectException(BadRequestException::class);
+
+        self::getInstance()->validateRequestHandshake($request);
+    }
+
     /**
      * @dataProvider getValidHandshakeResponses
      */
@@ -160,6 +171,22 @@ public static function getValidHandshakeRequests(): array
         return $cases;
     }
 
+    public static function getInvalidHandshakeRequestLines(): array
+    {
+        $headers = "Host: server.example.com\r
+Upgrade: websocket\r
+Connection: Upgrade\r
+Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==\r
+Origin: http://example.com\r
+Sec-WebSocket-Version: 13\r
+\r\n";
+
+        return [
+            'bare line feed ending the request line' => ["GET /chat HTTP/1.1\n\r\n".$headers],
+            'non-literal HTTP version' => ["GET /chat HTTP/1x1\r\n".$headers],
+        ];
+    }
+
     public static function getValidHandshakeResponses(): array
     {
         $cases = [];