diff --git a/src/Symfony/Component/Mime/Part/AbstractMultipartPart.php b/src/Symfony/Component/Mime/Part/AbstractMultipartPart.php
index 48b8620232c49..685d250627e43 100644
--- a/src/Symfony/Component/Mime/Part/AbstractMultipartPart.php
+++ b/src/Symfony/Component/Mime/Part/AbstractMultipartPart.php
@@ -91,7 +91,7 @@ public function asDebugString(): string
private function getBoundary(): string
{
if (null === $this->boundary) {
- $this->boundary = '_=_symfony_'.time().'_'.bin2hex(random_bytes(16)).'_=_';
+ $this->boundary = strtr(base64_encode(random_bytes(6)), '+/', '-_');
}
return $this->boundary;
diff --git a/src/Symfony/Component/Mime/Tests/Part/Multipart/FormDataPartTest.php b/src/Symfony/Component/Mime/Tests/Part/Multipart/FormDataPartTest.php
index a74ecea316ec9..dbc2e6eff9a22 100644
--- a/src/Symfony/Component/Mime/Tests/Part/Multipart/FormDataPartTest.php
+++ b/src/Symfony/Component/Mime/Tests/Part/Multipart/FormDataPartTest.php
@@ -91,4 +91,16 @@ public function testContentLineLength()
$this->assertEquals($foo, $parts[0]->bodyToString());
$this->assertEquals($bar, $parts[1]->bodyToString());
}
+
+ public function testBoundaryContentTypeHeader()
+ {
+ $f = new FormDataPart([
+ 'file' => new DataPart('data.csv', 'data.csv', 'text/csv'),
+ ]);
+ $headers = $f->getPreparedHeaders()->toArray();
+ $this->assertRegExp(
+ '/^Content-Type: multipart\/form-data; boundary=[a-zA-Z0-9\-_]{8}$/',
+ $headers[0]
+ );
+ }
}
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