diff --git a/scripts/Dpkg/Source/Package/V3/quilt.pm b/scripts/Dpkg/Source/Package/V3/quilt.pm
--- a/scripts/Dpkg/Source/Package/V3/quilt.pm
+++ b/scripts/Dpkg/Source/Package/V3/quilt.pm
@@ -123,6 +123,7 @@ sub read_patch_list {
             }
         }
         next if $opts{"skip_auto"} and $_ eq $auto_patch;
+        error(_g("%s contains an insecure path: %s"), $file, $_) if m{(^|/)\.\./};
         push @patches, $_;
     }
     close(SERIES);