diff --git a/main/manager.c b/main/manager.c
index 2ea6fae4cc27149b254725d27c7a1fa11bc90a85..6e9ae00104da336bcc06aba311e19dfe681e0be9 100644
--- a/main/manager.c
+++ b/main/manager.c
@@ -2819,6 +2819,7 @@ AST_THREADSTORAGE(userevent_buf);
  */
 void astman_append(struct mansession *s, const char *fmt, ...)
 {
+	int res;
 	va_list ap;
 	struct ast_str *buf;
 
@@ -2827,8 +2828,11 @@ void astman_append(struct mansession *s, const char *fmt, ...)
 	}
 
 	va_start(ap, fmt);
-	ast_str_set_va(&buf, 0, fmt, ap);
+	res = ast_str_set_va(&buf, 0, fmt, ap);
 	va_end(ap);
+	if (res == AST_DYNSTR_BUILD_FAILED) {
+		return;
+	}
 
 	if (s->f != NULL || s->session->f != NULL) {
 		send_string(s, ast_str_buffer(buf));
@@ -2888,6 +2892,7 @@ void astman_send_error(struct mansession *s, const struct message *m, char *erro
 
 void astman_send_error_va(struct mansession *s, const struct message *m, const char *fmt, ...)
 {
+	int res;
 	va_list ap;
 	struct ast_str *buf;
 	char *msg;
@@ -2897,8 +2902,11 @@ void astman_send_error_va(struct mansession *s, const struct message *m, const c
 	}
 
 	va_start(ap, fmt);
-	ast_str_set_va(&buf, 0, fmt, ap);
+	res = ast_str_set_va(&buf, 0, fmt, ap);
 	va_end(ap);
+	if (res == AST_DYNSTR_BUILD_FAILED) {
+		return;
+	}
 
 	/* astman_append will use the same underlying buffer, so copy the message out
 	 * before sending the response */
diff --git a/main/xmldoc.c b/main/xmldoc.c
index 399a7be978ca98ffc7efe96a9d875cb6920f102b..86c3f651218e1c8195ffaec7ead04a15bc2dd734 100644
--- a/main/xmldoc.c
+++ b/main/xmldoc.c
@@ -2646,14 +2646,18 @@ struct ast_xml_xpath_results *__attribute__((format(printf, 1, 2))) ast_xmldoc_q
 	struct documentation_tree *doctree;
 	RAII_VAR(struct ast_str *, xpath_str, ast_str_create(128), ast_free);
 	va_list ap;
+	int res;
 
 	if (!xpath_str) {
 		return NULL;
 	}
 
 	va_start(ap, fmt);
-	ast_str_set_va(&xpath_str, 0, fmt, ap);
+	res = ast_str_set_va(&xpath_str, 0, fmt, ap);
 	va_end(ap);
+	if (res == AST_DYNSTR_BUILD_FAILED) {
+		return NULL;
+	}
 
 	AST_RWLIST_RDLOCK(&xmldoc_tree);
 	AST_LIST_TRAVERSE(&xmldoc_tree, doctree, entry) {