diff --git a/transformations.c b/transformations.c
index c1ad7c967..f5c63b4c5 100644
--- a/transformations.c
+++ b/transformations.c
@@ -53,7 +53,16 @@

 #define TR_BUFFER_SIZE 65536

-static char _tr_buffer[TR_BUFFER_SIZE];
+/* two buffers are enough to allow infinite chaining (R/W <-> W/R) */
+#define TR_INF_CHAINS  2
+
+/* a separate set of chaining buffers for each script function argument */
+static char __tr_buffers[MAX_ACTION_ELEMS - 1][TR_INF_CHAINS][TR_BUFFER_SIZE];
+static int __crt_tr_buf, __crt_tr_link;
+
+#define get_tr_buffer() \
+	__tr_buffers[__crt_tr_buf] \
+		[__crt_tr_link = (__crt_tr_link + 1) % TR_INF_CHAINS]

 trans_extra_t *tr_extra_list;

@@ -144,21 +153,27 @@ int run_transformations(struct sip_msg *msg, trans_t *tr, pv_value_t *val)

 	if (tr==NULL || val==NULL) {
 		LM_DBG("null pointer\n");
-		return -1;
+		ret = -1;
+		goto out;
 	}

 	it = tr;
 	while (it) {
 		ret = (*it->trf)(msg, it->params, it->subtype, val);
 		if(ret!=0)
-			return ret;
+			goto out;
 		it = it->next;
 	}

-	return 0;
+out:
+	/* advancing the current set of buffers prevents any bugs when passing
+	 * multiple transformation-enabled vars as cfg function parameters */
+	__crt_tr_buf = (__crt_tr_buf + 1) % (MAX_ACTION_ELEMS - 1);
+
+	return ret;
 }

-static void trans_fill_left(pv_value_t *val, str pad, int len)
+static void trans_fill_left(pv_value_t *val, str pad, int len, char *_tr_buffer)
 {
 	char *p;
 	int r;
@@ -201,7 +216,7 @@ static void trans_fill_left(pv_value_t *val, str pad, int len)
 	}
 }

-static void trans_fill_right(pv_value_t *val, str pad, int len)
+static void trans_fill_right(pv_value_t *val, str pad, int len, char *_tr_buffer)
 {
 	char *p;
 	int r;
@@ -237,7 +252,7 @@ int tr_eval_string(struct sip_msg *msg, tr_param_t *tp, int subtype,
 		pv_value_t *val)
 {
 	int i, j;
-	char *p, *s;
+	char *p, *s, *_tr_buffer = get_tr_buffer();
 	str st;
 	pv_value_t v;

@@ -776,9 +791,9 @@ int tr_eval_string(struct sip_msg *msg, tr_param_t *tp, int subtype,
 				return 0;

 			if (subtype == TR_S_FILL_LEFT)
-				trans_fill_left(val, st, i);
+				trans_fill_left(val, st, i, _tr_buffer);
 			else
-				trans_fill_right(val, st, i);
+				trans_fill_right(val, st, i, _tr_buffer);

 			break;
 		case TR_S_WIDTH: