--- a/libc/inet/resolv.c
+++ b/libc/inet/resolv.c
@@ -1631,6 +1631,7 @@ int attribute_hidden __read_etc_hosts_r(
* struct in[6]_addr
* char line_buffer[BUFSZ+];
*/
+ memset(buf, 0, buflen);
parser->data = buf;
parser->data_len = aliaslen;
parser->line_len = buflen - aliaslen;