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-rw-r--r--lib/rack/utils.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/rack/utils.rb b/lib/rack/utils.rb
index 74303eff..884e6045 100644
--- a/lib/rack/utils.rb
+++ b/lib/rack/utils.rb
@@ -449,7 +449,7 @@ module Rack
                 head = buf.slice!(0, i+2) # First \r\n
                 buf.slice!(0, 2)          # Second \r\n
 
-                filename = head[/Content-Disposition:.* filename="?([^\";]*)"?/ni, 1]
+                filename = head[/Content-Disposition:.* filename=(?:"((?:\\.|[^\"])*)"|([^;\s]*))/ni, 1]
                 content_type = head[/Content-Type: (.*)#{EOL}/ni, 1]
                 name = head[/Content-Disposition:.*\s+name="?([^\";]*)"?/ni, 1] || head[/Content-ID:\s*([^#{EOL}]*)/ni, 1]