diff --git a/CHANGES b/CHANGES
index 9d58c90f80..294e787056 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,5 @@
+4401.	[bug]		Fix leaks in contrib DLZ code. [RT #42707]
+
 4400.	[doc]		Description of masters with TSIG, allow-query and
 			allow-transfer options in catalog zones. [RT #42692]
 
diff --git a/contrib/dlz/modules/mysql/dlz_mysql_dynamic.c b/contrib/dlz/modules/mysql/dlz_mysql_dynamic.c
index e2bff75ef6..1fe750c4b0 100644
--- a/contrib/dlz/modules/mysql/dlz_mysql_dynamic.c
+++ b/contrib/dlz/modules/mysql/dlz_mysql_dynamic.c
@@ -526,6 +526,7 @@ mysql_process_rs(mysql_instance_t *db, dns_sdlzlookup_t *lookup,
 				db->log(ISC_LOG_ERROR,
 					"MySQL module ttl must be "
 					"a postive number");
+				free(tmpString);
 				return (ISC_R_FAILURE);
 			}
 
diff --git a/contrib/dlz/modules/sqlite3/dlz_sqlite3_dynamic.c b/contrib/dlz/modules/sqlite3/dlz_sqlite3_dynamic.c
index 99c7b1c9ad..f90f185ebe 100644
--- a/contrib/dlz/modules/sqlite3/dlz_sqlite3_dynamic.c
+++ b/contrib/dlz/modules/sqlite3/dlz_sqlite3_dynamic.c
@@ -601,6 +601,7 @@ sqlite3_process_rs(sqlite3_instance_t *db, dns_sdlzlookup_t *lookup,
 				db->log(ISC_LOG_ERROR,
 					"SQLite3 module: TTL must be "
 					"a postive number");
+				free(tmpString);
 				return (ISC_R_FAILURE);
 			}