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