diff -Naur db-4.8.30.NC.old/repmgr/repmgr_net.c db-4.8.30.NC/repmgr/repmgr_net.c
--- db-4.8.30.NC.old/repmgr/repmgr_net.c	2021-10-03 10:22:53.391893577 +0200
+++ db-4.8.30.NC/repmgr/repmgr_net.c	2021-10-03 10:23:03.599070978 +0200
@@ -1331,7 +1331,7 @@
 	}
 
 	ret = net_errno;
-	__db_err(env, ret, why);
+	__db_err(env, ret, "%s", why);
 clean:	if (s != INVALID_SOCKET)
 		(void)closesocket(s);
 	return (ret);
diff -Naur db-4.8.30.NC.old/txn/txn.c db-4.8.30.NC/txn/txn.c
--- db-4.8.30.NC.old/txn/txn.c	2021-10-03 10:22:53.445894516 +0200
+++ db-4.8.30.NC/txn/txn.c	2021-10-03 10:23:03.632071552 +0200
@@ -113,7 +113,7 @@
 		return (ret);
 	if (parent != NULL && !F_ISSET(parent, TXN_SNAPSHOT) &&
 	    LF_ISSET(DB_TXN_SNAPSHOT)) {
-		__db_errx(env,
+		__db_errx(env, "%s",
 		    "Child transaction snapshot setting must match parent");
 		return (EINVAL);
 	}
@@ -168,7 +168,7 @@
 
 	*txnpp = NULL;
 	if ((ret = __os_calloc(env, 1, sizeof(DB_TXN), &txn)) != 0) {
-		__db_errx(env, TxnAlloc);
+		__db_errx(env, "%s", TxnAlloc);
 		return (ret);
 	}
 
@@ -315,7 +315,7 @@
 	int ret;
 
 	if ((ret = __os_calloc(env, 1, sizeof(DB_TXN), &txn)) != 0) {
-		__db_errx(env, TxnAlloc);
+		__db_errx(env, "%s", TxnAlloc);
 		return (ret);
 	}