Net::OAuth::Client versions before 0.32 for Perl allow the service provider to silently downgrade OAuth 1.0a to OAuth 1.0 in get request token Net::OAuth versions before 0.32 for Perl allow memory exhaustion via unbounded caching of failed module loads in smart require Net::OAuth versions before 0.33 for Perl allow the sender to choose the signature algorithm in verify Net::OAuth versions before 0.33 for Perl check HMAC-SHA1, HMAC-SHA256 and PLAINTEXT signatures with a non-constant-time comparison in verify