diff --git a/src/backend/commands/copy.c b/src/backend/commands/copy.c
index e8a125b..47ace0e 100644
--- a/src/backend/commands/copy.c
+++ b/src/backend/commands/copy.c
@@ -2377,6 +2377,14 @@ BeginCopyFrom(Relation rel,
 	{
 		struct stat st;
 
+		/*
+		 * Prevent read from relative path
+		 */
+		if (!is_absolute_path(filename))
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_NAME),
+					 errmsg("relative path not allowed for COPY from file")));
+
 		cstate->filename = pstrdup(filename);
 		cstate->copy_file = AllocateFile(cstate->filename, PG_BINARY_R);