Depends on how the CLA is worded. It's possible for the CLA to have the contributor retain all copyright over their contributions (thus preventing the maintaine

Depends on how the CLA is worded. It's possible for the CLA to have the contributor retain all copyright over their contributions (thus preventing the maintainer from pulling a 180 and suddenly licensing the contributed code commercially) while still forcing the contributor to assert that what they made is not stolen code.